Reference:Movements: Difference between revisions

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<div class="rp-era"><div class="rp-era-name">Oyster / Oysterdate Precision</div><div class="rp-chips">[[#cal-1210|1210]] [[#cal-1215|1215]] [[#cal-1216|1216]] [[#cal-1220|1220]] [[#cal-1225|1225]] [[#cal-1200|1200]]</div></div>

<div class="rp-era"><div class="rp-era-name">Cellini and dress watches</div><div class="rp-chips">[[#cal-1600|1600]] [[#cal-7040|7040]]</div></div>

<div class="rp-era"><div class="rp-era-name">Vintage sport (1950s–80s)</div><div class="rp-chips">[[#cal-1030|1030]] [[#cal-1035|1035]] [[#cal-1036|1036]] [[#cal-1040|1040]] [[#cal-1065|1065]] [[#cal-1066|1066]] [[#cal-1530|1530]] [[#cal-1520|1520]] [[#cal-1535|1535]] [[#cal-1525|1525]] [[#cal-1560|1560]] [[#cal-1565|1565]] [[#cal-1570|1570]] [[#cal-1575|1575]]</div></div>

<div class="rp-era"><div class="rp-era-name">Vintage sport (1950s–80s)</div><div class="rp-chips">[[#cal-1030|1030]] [[#cal-1035|1035]] [[#cal-1036|1036]] [[#cal-1040|1040]] [[#cal-1050|1050]] [[#cal-1065|1065]] [[#cal-1066|1066]] [[#cal-1530|1530]] [[#cal-1520|1520]] [[#cal-1535|1535]] [[#cal-1525|1525]] [[#cal-1560|1560]] [[#cal-1565|1565]] [[#cal-1570|1570]] [[#cal-1575|1575]]</div></div>

<div class="rp-era"><div class="rp-era-name">Modern sport (1988–2023 coverage)</div><div class="rp-chips">[[#cal-3000|3000]] [[#cal-3035|3035]] [[#cal-3075|3075]] [[#cal-3085|3085]] [[#cal-3130|3130]] [[#cal-3132|3132]] [[#cal-3135|3135]] [[#cal-3175|3175]] [[#cal-3185|3185]] [[#cal-3186|3186]] [[#cal-3187|3187]] [[#cal-3230|3230]] [[#cal-3235|3235]] [[#cal-3285|3285]]</div></div>

<div class="rp-era"><div class="rp-era-name">Milgauss</div><div class="rp-chips">[[#cal-1080|1080]] [[#cal-1580|1580]] [[#cal-3131|3131]]</div></div>

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== Early chronograph movement

The early Oyster chronograph references use Valjoux ébauches, with Rolex caliber designations that should be kept distinct from the maker’s base number. Available auction records support a limited Cal. 13 / Valjoux 23-family entry. That evidence concerns the 3525 and does not identify every early Rolex chronograph movement.

The early Oyster chronograph references use Valjoux ébauches, with Rolex caliber designations that should be kept distinct from the maker’s base number. Available auction records support a limited Cal. 13 / Valjoux 23-family entry. Ebauches S.A.'s 1951 technical guide labels a two-pusher, 13-ligne movement “VZ 23” ([https://myretrowatches.co.uk/wp-content/uploads/2024/09/Valjoux-VZ-23-Technical-Guide.pdf technical guide, 2nd edition March 1953]). That nomenclature does not establish Rolex fitment. The Cal. 13 evidence discussed here concerns the 3525 and does not identify every early Rolex chronograph movement.

Ref. [[Reference:2021|2021]] is a pre-Oyster monopusher. Published descriptions give movement sizes from 13 to 16½ lignes; Uhrenkosmos names a Valjoux VZ in one early monopusher, while auction catalogues describe different executions. The available records do not support a reference-wide caliber assignment. Keep these descriptions separate from the Cal. 13 entry below. [https://www.uhrenkosmos.com/rolex-daytona-seine-technik-und-geschichte/ Uhrenkosmos, early monopusher movement] [https://www.phillips.com/detail/rolex/115419 Phillips, case 12'010] [https://www.cambiaste.com/it/asta-0795/rolex---rarissimo-cronografo-due-contatori-da-polso-monopulsante-in-ac-270066 Cambi, steel case 14xxx]

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The architecture of Cal. 360 is disputed. Christie's describes a 1938 ref. 2835 "Prince Elegant" with a tonneau-shaped 15-jewel movement, and Charles Jarman's ''The Rolex Reference Guide'' (4th edition) calls Cal. 360 a manual, small-seconds, tonneau-shaped movement with a SuperBalance. Watch Doctor’s online chart instead lists a rectangular, 18-jewel movement measuring 18 × 27mm. The page does not identify an underlying Rolex document.

Christie's also describes a rectangular 17-jewel Cal. 360 in 1937 Precision ref. 3140 case 41,362. Monaco Legend gives Cal. 360 for another 1937 ref. 3140, case 41,465, but no jewel count. These are catalogue attributions to individual watches; they do not settle the conflicting movement descriptions. [https://www.christies.com/lot/lot-rolex-a-9k-gold-rectangular-curved-wristwatch-5130486/ Christie’s, 2008 lot 13]; [https://www.monacolegendauctions.com/auction/exclusive-timepieces-33/lot-219 Monaco Legend, 2024 lot 219]

Jarman dates Cal. 360 to 1937. The expansion of the HW designation remains unconfirmed; it should be retained as a designation rather than expanded to Hans Wilsdorf. The differing shape and jewel descriptions need comparison with the movement in the individual watch. Ineichen’s 2016 catalogue attributes C.360 to a Prince ref. 1880 and describes a nickel-plated lever movement. That is one lot-level attribution; it does not resolve the conflicting descriptions above. [https://ineichen.com/upload/iblock/83c/fnnltq7byndm2n2lwa14zfgz3qzl1tuc.pdf Ineichen, Auction 164, lot 133]

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This Aegler-supplied 10½-ligne hand-wound family uses the 700/710 architecture. It has a straight-line lever escapement, monometallic Superbalance adjusted to six positions, self-compensating Breguet balance spring, and swan-neck micrometer regulator, with no documented shock protection. Antiquorum names Cal. 700 in its catalogue for ref. [[Reference:3358|3358]], case 51,419, with 18 jewels; its ref. [[Reference:2081|2081]] case 599,744 lot names the same caliber and grade but records 15 jewels. The discrepancy is unresolved, so the jewel count is left unspecified here. [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-225 Antiquorum, ref. 3358] [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-226 Antiquorum, ref. 2081] The movement powers the original Air-King 4925 and its Air-Lion, Air-Tiger, and Air-Giant siblings, including the sub-seconds 4365, mid-size 4444, and 4647 Hunter Precision. Its architecture links the pre-war Prince and Bubbleback movements with the post-war automatic Cal. 1030. Cal. 700 and 710 are hand-wound movements; Cal. 720 belongs to the automatic branch. White’s *The Vintage Rolex Field Manual* maps [[Reference:5031|ref. 5031]] to Cal. 710 in a reference table, but auction catalogues describe 5031 examples as automatic date watches. Christie’s [https://www.christies.com/en/lot/lot-204100 listing] records movement number 37519 but no caliber; Antiquorum’s [https://catalog.antiquorum.swiss/en/lots/rolex-lot-120-203 1995], [https://catalog.antiquorum.swiss/en/lots/rolex-lot-53-191 1999] and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-222-285 2009] entries do not name a caliber and report differing sizes and jewel counts. Sotheby’s 2020 and 2022 entries say only “automatic.” The available records do not resolve the conflict, so the 5031 is not assigned to Cal. 710, A.295, 740, or 745 here.

This Aegler-supplied 10½-ligne hand-wound family uses the 700/710 architecture. It has a straight-line lever escapement, monometallic Superbalance adjusted to six positions, self-compensating Breguet balance spring, and swan-neck micrometer regulator, with no documented shock protection. Antiquorum names Cal. 700 in its catalogue for ref. [[Reference:3358|3358]], case 51,419, with 18 jewels; its ref. [[Reference:2081|2081]] case 599,744 lot names the same caliber and grade but records 15 jewels. The discrepancy is unresolved, so the jewel count is left unspecified here. [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-225 Antiquorum, ref. 3358] [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-226 Antiquorum, ref. 2081] The movement powers the original Air-King 4925 and its Air-Lion, Air-Tiger, and Air-Giant siblings, including the sub-seconds 4365, mid-size 4444, and 4647 Hunter Precision. Its architecture links the pre-war Prince and Bubbleback movements with the post-war automatic Cal. 1030. Cal. 700 and 710 are hand-wound movements; Cal. 720 belongs to the automatic branch. TimeAnagram lists Cal. 710 for a manual [[Reference:3121|ref. 3121]] and shows an open-movement photograph marked Rolex 15 Rubies and Superbalance, but no readable caliber number. Keep Cal. 710 as the seller’s attribution to that watch. White’s *The Vintage Rolex Field Manual* maps [[Reference:5031|ref. 5031]] to Cal. 710 in a reference table, but auction catalogues describe 5031 examples as automatic date watches. Christie’s [https://www.christies.com/en/lot/lot-204100 listing] records movement number 37519 but no caliber; Antiquorum’s [https://catalog.antiquorum.swiss/en/lots/rolex-lot-120-203 1995], [https://catalog.antiquorum.swiss/en/lots/rolex-lot-53-191 1999] and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-222-285 2009] entries do not name a caliber and report differing sizes and jewel counts. Sotheby’s 2020 and 2022 entries say only “automatic.” The available records do not resolve the conflict, so the 5031 is not assigned to Cal. 710, A.295, 740, or 745 here.

Auction catalogues identify manual Cal. 710 in three ref. 6082 watches: Antiquorum cases 784516 and 721396, and Monaco Legend case 810693. Colin White’s reference table also pairs 6082 with Cal. 710. Antiquorum’s Hong Kong 2021 narrative calls case 721396 self-winding, while its movement field names Cal. 710. Kibble Watches and Watch.de assign Cal. 1210 to separate examples; Watch.de reports case 721965, a 1961 date and movement no. 1162170. Neither dealer listing provides a readable movement photograph, so these remain seller attributions. [[Reference:6082|The 6082 article]] keeps the conflicting records tied to individual watches.

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The pallet fork runs in jewels, while the escape wheel has shock-mounted settings and cap jewels on both pivots, matching the treatment of the balance. Indirect centre seconds, driven from the fourth wheel through a friction-sprung pinion, can produce seconds-hand flutter even in a healthy movement. The earliest examples may lack shock protection; Antiquorum's 1946 ref. 4560 description names none.

Documented fitments include refs. 3745, 4560, 6420, 6422, 6426/6427, 6466, 6480, 6482, 6494, 9083 and 9659. Bonhams also records a ref. 6694 with a III.60 caseback date on Cal. 1210.

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Cal. 1030 is a bidirectionally wound automatic used in 1950s Oyster references. Its 5.85mm profile ended the domed Bubbleback caseback, while the cutaway "butterfly" rotor stamped ROLEX PERPETUAL PATENTED is the usual visual identifier. Finishing includes perlage on the rhodium-plated main plate, brushed bridges, polished screw heads and red anodized-aluminium reversing wheels. A conventional index regulates the movement; the visible regulator arm distinguishes it from the later free-sprung 1560 and 1570. Documented fitments include ref. 6098 from 1952 ~~and~~ Oyster Perpetual 6567 ~~from the 1950s~~, Submariners 6536, 6536-1 and 6538, Explorer 6610 and Air-King 6552. The ~~same movement appeared~~ in ~~chronometer~~ and ~~non-chronometer~~ watches.

Cal. 1030 is a bidirectionally wound automatic used in 1950s Oyster references. Its 5.85mm profile ended the domed Bubbleback caseback, while the cutaway "butterfly" rotor stamped ROLEX PERPETUAL PATENTED is the usual visual identifier. Finishing includes perlage on the rhodium-plated main plate, brushed bridges, polished screw heads and red anodized-aluminium reversing wheels. A conventional index regulates the movement; the visible regulator arm distinguishes it from the later free-sprung 1560 and 1570. Documented fitments include ref. 6098 from 1952, Oyster Perpetual 6502 and 6567, Submariners 6536, 6536-1 and 6538, Explorer 6610 and Air-King 6552. Artcurial, Antiquorum and Sotheby’s catalogue 6502 examples with Cal. 1030; Watch-Wiki independently lists the association. The case 36701 records conflict: the Invaluable archive of Monaco Legend labels it 6502, while Phillips identifies that case as 6603. The competing catalogue attributions leave its reference unresolved. [https://www.invaluable.com/auction-lot/rolex-oyster-perpetual-ref-6502-honeycomb-dial-166-c-8e042b2aae Invaluable archive of Monaco Legend, lot 166]; [https://www.phillips.com/detail/rolex/134192 Phillips, lot 254] The Field Manual and several auction catalogues identify Cal. 1030 in Oyster Perpetual 6567 examples; Ineichen lists Cal. 1050 for one 6567. Other catalogues assign Cal. 1050 to refs. 6564, 6569 and Submariner 6536/1. These are descriptions of individual watches; the Cal. 1050 entry records the competing attributions.

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Antiquorum and Dr. Crott report that a 1960 Rolex catalogue proposed ref. 1020 as a successor to the 6556 and that the model was never produced. Neither source reproduces the catalogue page in the reviewed listing; this remains an attributed historical note. No production caliber or fitment is established for 1020, so it is not indexed as a movement.

=== Cal. 1050 ===

{| class="wikitable" style="width:280px; font-size:90%;"

! detail

! value

|-

| type

| Automatic, as described in the cited catalogues

|-

| jewels

| 25 in the Antiquorum 6564, Bonhams 6569, and Christie's 6536/1 descriptions

|-

| catalogue attributions

| Oyster Perpetual refs. 6564, 6567 and 6569; Submariner ref. 6536/1

|}

Several auction catalogues identify Cal. 1050 in watches dated to the 1950s. Antiquorum names it in a ref. 6564; Bonhams in a ref. 6569; Christie's in a Submariner 6536/1; and Ineichen in a ref. 6567. The 6564 and 6567 also appear in records naming Cal. 1030. These are catalogued assignments to individual watches. Cal. 1050’s technical relationship to Cal. 1030 and any changeover sequence remain unresolved. [https://catalog.antiquorum.swiss/en/lots/rolex-lot-63-114 Antiquorum, ref. 6564, lot 114] [https://images3.bonhams.com/original?src=Images%2Flive%2F2015-04%2F23%2FS-22886-0-1.pdf Bonhams, ref. 6569, lot 312] [https://www.christies.com/lot/lot-rolex-a-rare-stainless-steel-automatic-wristwatch-5892833/ Christie's, Submariner ref. 6536/1] [https://ineichen.com/auctions/timed-83/4/ Ineichen, ref. 6567, lot 4]

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Gardiner Houlgate catalogues Cal. 1560 in one ref. 1023, serial 1136xxx, dated circa 1964. Time Connection II’s replacement-parts table lists both Cal. 1560 and 1570 under the reference, without dates or a sequence. The auction record documents one Cal. 1560 example; it does not establish when either caliber entered production.

Auction catalogues also identify Cal. 1560 in ref. 1024 examples dated circa 1965/66 and circa 1970. Antiquorum lists Cal. 1560 in a ref. 1011 dated 1960, case 546423, and in two lots jointly catalogued as refs. 1010/1011, dated 1960 and 1962. Heritage also lists Cal. 1560 in an undated ref. 1011 sold in 2012. Heritage and Bonhams list Cal. 1560 in individual ref. 1010 lots dated circa 1962 and circa 1967; Antiquorum lists Cal. 1570 in an individual ref. 1010 circa 1968. The Field Manual lists Cal. 1560 for ref. 1010. A 1stDibs item text also names Cal. 1560 for its claimed 1010, though the page title says 1011; treat it as seller-level evidence. These records document both attributions for ref. 1010, and its changeover year remains open; see [[Reference:1010|ref. 1010]]. Antiquorum ~~also~~ catalogues Cal. 1560 in ~~a 1963~~ ref. 1501, case 953,774; see [[Reference:1501|ref. 1501]] and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-247-67 the lot ~~record~~].

Auction catalogues also identify Cal. 1560 in ref. 1024 examples dated circa 1965/66 and circa 1970. Antiquorum lists Cal. 1560 in a ref. 1011 dated 1960, case 546423, and in two lots jointly catalogued as refs. 1010/1011, dated 1960 and 1962. Heritage also lists Cal. 1560 in an undated ref. 1011 sold in 2012. Heritage and Bonhams list Cal. 1560 in individual ref. 1010 lots dated circa 1962 and circa 1967; Antiquorum lists Cal. 1570 in an individual ref. 1010 circa 1968. The Field Manual lists Cal. 1560 for ref. 1010. A 1stDibs item text also names Cal. 1560 for its claimed 1010, though the page title says 1011; treat it as seller-level evidence. These records document both attributions for ref. 1010, and its changeover year remains open; see [[Reference:1010|ref. 1010]]. Antiquorum catalogues Cal. 1560 in ref. 1501 examples dated 1962 (case 761,220) and 1963 (case 953,774); see [[Reference:1501|ref. 1501]], [https://catalog.antiquorum.swiss/en/lots/rolex-ref-1501-oyster-perpetual-date-lot-386-200 the 1962 lot], and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-247-67 the 1963 lot].

The Vintage Rolex Field Manual assigns Cal. 1560 to proposed monopusher refs. 1074 and 1223, but cites no identified watch or movement evidence for either link. [https://watchguy.co.uk/tmp/Rolex%201560.pdf Rolex’s standard Cal. 1560 parts sheet] describes a self-winding, sweep-seconds movement and does not document chronograph works. Christie’s catalogues two 1074 wristwatches without naming a caliber. A separate [https://www.christies.com/en/lot/lot-204177 Christie’s 1920s monopusher listing] gives 1223 as the case number, not as a verified reference; a [https://www.christies.com/en/lot/lot-6049981 ref. 28D1 pocket chronograph] uses 1223 as its movement number. Treat both Field Manual caliber assignments as unverified. [https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, printed p. 74] [https://www.christies.com/en/lot/lot-874668 Christie’s, model 1074] [https://www.christies.com/en/lot/lot-1473066 Christie’s, ref. 1074 case 25433]

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Christie’s lists Cal. 1080 in 6543 case 145'111. Revolution also ~~assigns~~ the caliber to the 6543 ~~and~~ describes a Cal. 1030 relationship. Sotheby’s called movement N726507 in 6541 case 412'479 Cal. 1080 in 2018; Phillips listed the same case and movement number as Cal. 1055 in 2026. The surviving ~~catalogues document these watch-level labels,~~ not a ~~settled specification or changeover~~ sequence.

Christie’s lists Cal. 1080 in 6543 case 145'111. Revolution and Watch-Wiki also assign the caliber to the 6543; Revolution describes a Cal. 1030 relationship. Watch-Wiki is a secondary reference index, and it does not resolve Christie’s Cal. 1065 label for case 145'159. Sotheby’s called movement N726507 in 6541 case 412'479 Cal. 1080 in 2018; Phillips listed the same case and movement number as Cal. 1055 in 2026. The surviving records do not establish a caliber sequence.

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|}

Cal. 1055 ~~is documented~~ in the first four-digit Day-Date references~~, from 1956 to 1959: refs~~. ~~6510,~~ 6511, ~~6611, 6612~~ and ~~6613~~. ~~Its~~ rhodium-plated bridges ~~carry~~ oeil-de-perdrix ("partridge-eye") circular graining rather than Côtes de Genève. Documented examples were adjusted to temperature and five positions.

Cal. 1055 appears in catalogues for the first four-digit Day-Date references and is commonly dated 1956–1959. A 2017 Dorotheum listing pairs it with a 6511/8 dated circa 1965; Pergola’s unofficial chart places the case number in its 1956 band, and the lot photo has no readable serial. Treat the later date as an unresolved catalogue attribution. Cal. 1055 has rhodium-plated bridges with oeil-de-perdrix ("partridge-eye") circular graining rather than Côtes de Genève. Documented examples were adjusted to temperature and five positions.

Reference histories commonly date the 6611 to 1957 and associate it with the second, chronometer-certified 1055 generation. Phillips lists caliber 1055 on its 1956 gold 6611 and 1055B on its 1958 white-gold 6611B; catalogues do not use the suffix consistently. The dial wording changes to “Superlative Chronometer Officially Certified.”

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Steel school-watch records create a separate problem: Antiquorum lists 1556 for a 2002 lot and 1066 for a 2013 lot, while Phillips describes later steel Day-Date prototypes with 1555-series movements. These are catalogue descriptions of disputed school/prototype watches, not confirmed 6611 production fitments. See [[Reference:6611|the 6611 record]] for the lot-level distinctions.

Auction catalogues ~~also~~ disagree on the movement fitted to ref. 6511. Phillips lists Cal. 1555 for case 111,654; Phillips lot 41, Antiquorum lot 81, Bonhams lot 156, ~~and~~ Monaco Legend lots 22 and 220 list Cal. 1055. The ~~lot descriptions do not establish whether~~ the ~~1555 label~~ is a ~~mistake or a later movement. Keep the~~ attribution attached to the ~~individual lot~~.

Auction catalogues disagree on the movement fitted to ref. 6511. Phillips lists Cal. 1555 for case 111,654, and Dorotheum lists Cal. 1555 for case 166736. Phillips lot 41, Antiquorum lot 81, Bonhams lot 156, Monaco Legend lots 22 and 220, and Dorotheum's 2017 lot for case 166744 list Cal. 1055. Phillips dates Cal. 1555 to 1959, later than the dates assigned to both 1555-labelled cases. The 2017 Dorotheum listing dates case 166744 circa 1965, while Pergola's unofficial chart puts the number in its 1956 band. Its front-view image offers no readable serial, leaving the two dates in conflict. Each entry is a catalogue attribution; keep it attached to its lot pending inspection of the movement.

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* [https://www.phillips.com/detail/rolex/138071 Phillips, ref. 6609 case 355605, Cal. 1065]

* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-63 Antiquorum, ref. 6567, 1956, Cal. 1030]

* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-63-114 Antiquorum, 2000, ref. 6564, Cal. 1050]

* [https://ineichen.com/auctions/timed-83/4/ Ineichen, 2025, ref. 6567, Cal. 1050]

* [https://images3.bonhams.com/original?src=Images%2Flive%2F2015-04%2F23%2FS-22886-0-1.pdf Bonhams, 2015, ref. 6569, Cal. 1050]

* [https://www.christies.com/lot/lot-rolex-a-rare-stainless-steel-automatic-wristwatch-5892833/ Christie's, circa 1955, Submariner ref. 6536/1, Cal. 1050]

* [https://www.adams.ie/W103-lot-33-ROLEX-REF-1022-OYSTER-PERPETUAL-18K-YELLOW-GOLD-FLORENTINE-FINISH-CASE-A?auction_no=W103&page_no=3&sort_by=lot_no Adams, ref. 1022, 2025, Cal. 1560]

* [https://images3.bonhams.com/original?src=Images%2Flive%2F2015-04%2F23%2FS-22886-0-1.pdf Bonhams, ref. 1022, 2015, Cal. 1560]

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* [https://www.phillips.com/detail/rolex/CH080115/40 Phillips, 2015, ref. 6511 case 111,654, movement listed as 1555]

* [https://www.dorotheum.com/en/l/10072651/ Dorotheum, 2026, ref. 6511 case 166736, movement listed as 1555]

* [https://www.dorotheum.com/de/l/604595/ Dorotheum, 2017, ref. 6511/8 case 166744, movement listed as 1055]

* [https://www.phillips.com/detail/rolex/CH080219/247 Phillips, Cal. 1555 chronology and experimental steel Day-Date]

* [https://www.phillips.com/detail/rolex/CH080115/41 Phillips, 2015, ref. 6511 case 134,692, movement listed as 1055]

* [https://www.phillips.com/detail/rolex/CH080115/50 Phillips, 2015, 6611 case 214,124, caliber 1055]

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* [https://www.christies.com/lot/lot-5612347 Christie’s, ref. 6543 case 145'159, Cal. 1065]

* [https://revolutionwatch.com/rolex-milgauss-one-in-a-thousand/ Revolution, Milgauss movement and 6543 history]

* [https://www.watch-wiki.net/doku.php?id=Rolex_calibres Stephen Foskett, Watch-Wiki Cal. 1080 reference index for 6543]

* [https://www.sothebys.com/en/auctions/ecatalogue/2018/important-watches-n09952/lot.256.html Sotheby’s, 6541 case 412'479, Cal. 1080]

* [https://www.phillips.com/detail/rolex/206388 Phillips, same case and movement number, Cal. 1055]

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* [https://www.watchrepairtalk.com/topic/28412-rolex-3135-510-drive-wheel-for-ratchet-appears-to-be-worn-not-winding-watch-enough/ Watch Repair Talk — Rolex 3135-510 ratchet drive wheel wear]

* [https://catalog.antiquorum.swiss/en/lots/rolex-ref-3121-oyster-grenfell-lot-376-219 Antiquorum Geneva, 3 April 2025, lot 219]: ref. 3121 Oyster Grenfell, case 43,475, circa 1938, Cal. 59, 17 jewels.

* [https://timeanagram.com/products/7507 TimeAnagram, item 7507]: ref. 3121 listed as manual Cal. 710; the movement image shows no readable caliber stamp.

* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra

* [https://watchguy.co.uk/tmp/Rolex%201560.pdf Rolex Cal. 1560 spare-parts sheet no. 31; scan hosted by WatchGuy]

@@ Line 21: / Line 21: @@
 <div class="rp-era"><div class="rp-era-name">Oyster / Oysterdate Precision</div><div class="rp-chips">[[#cal-1210|1210]] [[#cal-1215|1215]] [[#cal-1216|1216]] [[#cal-1220|1220]] [[#cal-1225|1225]] [[#cal-1200|1200]]</div></div>
 <div class="rp-era"><div class="rp-era-name">Cellini and dress watches</div><div class="rp-chips">[[#cal-1600|1600]] [[#cal-7040|7040]]</div></div>
-<div class="rp-era"><div class="rp-era-name">Vintage sport (1950s–80s)</div><div class="rp-chips">[[#cal-1030|1030]] [[#cal-1035|1035]] [[#cal-1036|1036]] [[#cal-1040|1040]] [[#cal-1065|1065]] [[#cal-1066|1066]] [[#cal-1530|1530]] [[#cal-1520|1520]] [[#cal-1535|1535]] [[#cal-1525|1525]] [[#cal-1560|1560]] [[#cal-1565|1565]] [[#cal-1570|1570]] [[#cal-1575|1575]]</div></div>
+<div class="rp-era"><div class="rp-era-name">Vintage sport (1950s–80s)</div><div class="rp-chips">[[#cal-1030|1030]] [[#cal-1035|1035]] [[#cal-1036|1036]] [[#cal-1040|1040]] [[#cal-1050|1050]] [[#cal-1065|1065]] [[#cal-1066|1066]] [[#cal-1530|1530]] [[#cal-1520|1520]] [[#cal-1535|1535]] [[#cal-1525|1525]] [[#cal-1560|1560]] [[#cal-1565|1565]] [[#cal-1570|1570]] [[#cal-1575|1575]]</div></div>
 <div class="rp-era"><div class="rp-era-name">Modern sport (1988–2023 coverage)</div><div class="rp-chips">[[#cal-3000|3000]] [[#cal-3035|3035]] [[#cal-3075|3075]] [[#cal-3085|3085]] [[#cal-3130|3130]] [[#cal-3132|3132]] [[#cal-3135|3135]] [[#cal-3175|3175]] [[#cal-3185|3185]] [[#cal-3186|3186]] [[#cal-3187|3187]] [[#cal-3230|3230]] [[#cal-3235|3235]] [[#cal-3285|3285]]</div></div>
 <div class="rp-era"><div class="rp-era-name">Milgauss</div><div class="rp-chips">[[#cal-1080|1080]] [[#cal-1580|1580]] [[#cal-3131|3131]]</div></div>
@@ Line 43: / Line 43: @@
 == Early chronograph movement
-The early Oyster chronograph references use Valjoux ébauches, with Rolex caliber designations that should be kept distinct from the maker’s base number. Available auction records support a limited Cal. 13 / Valjoux 23-family entry. That evidence concerns the 3525 and does not identify every early Rolex chronograph movement.
+The early Oyster chronograph references use Valjoux ébauches, with Rolex caliber designations that should be kept distinct from the maker’s base number. Available auction records support a limited Cal. 13 / Valjoux 23-family entry. Ebauches S.A.'s 1951 technical guide labels a two-pusher, 13-ligne movement “VZ 23” ([https://myretrowatches.co.uk/wp-content/uploads/2024/09/Valjoux-VZ-23-Technical-Guide.pdf technical guide, 2nd edition March 1953]). That nomenclature does not establish Rolex fitment. The Cal. 13 evidence discussed here concerns the 3525 and does not identify every early Rolex chronograph movement.
 Ref. [[Reference:2021|2021]] is a pre-Oyster monopusher. Published descriptions give movement sizes from 13 to 16½ lignes; Uhrenkosmos names a Valjoux VZ in one early monopusher, while auction catalogues describe different executions. The available records do not support a reference-wide caliber assignment. Keep these descriptions separate from the Cal. 13 entry below. [https://www.uhrenkosmos.com/rolex-daytona-seine-technik-und-geschichte/ Uhrenkosmos, early monopusher movement] [https://www.phillips.com/detail/rolex/115419 Phillips, case 12'010] [https://www.cambiaste.com/it/asta-0795/rolex---rarissimo-cronografo-due-contatori-da-polso-monopulsante-in-ac-270066 Cambi, steel case 14xxx]
@@ Line 192: / Line 192: @@
 The architecture of Cal. 360 is disputed. Christie's describes a 1938 ref. 2835 "Prince Elegant" with a tonneau-shaped 15-jewel movement, and Charles Jarman's ''The Rolex Reference Guide'' (4th edition) calls Cal. 360 a manual, small-seconds, tonneau-shaped movement with a SuperBalance. Watch Doctor’s online chart instead lists a rectangular, 18-jewel movement measuring 18 × 27mm. The page does not identify an underlying Rolex document.
+Christie's also describes a rectangular 17-jewel Cal. 360 in 1937 Precision ref. 3140 case 41,362. Monaco Legend gives Cal. 360 for another 1937 ref. 3140, case 41,465, but no jewel count. These are catalogue attributions to individual watches; they do not settle the conflicting movement descriptions. [https://www.christies.com/lot/lot-rolex-a-9k-gold-rectangular-curved-wristwatch-5130486/ Christie’s, 2008 lot 13]; [https://www.monacolegendauctions.com/auction/exclusive-timepieces-33/lot-219 Monaco Legend, 2024 lot 219]
 Jarman dates Cal. 360 to 1937. The expansion of the HW designation remains unconfirmed; it should be retained as a designation rather than expanded to Hans Wilsdorf. The differing shape and jewel descriptions need comparison with the movement in the individual watch. Ineichen’s 2016 catalogue attributes C.360 to a Prince ref. 1880 and describes a nickel-plated lever movement. That is one lot-level attribution; it does not resolve the conflicting descriptions above. [https://ineichen.com/upload/iblock/83c/fnnltq7byndm2n2lwa14zfgz3qzl1tuc.pdf Ineichen, Auction 164, lot 133]
@@ Line 517: / Line 519: @@
 |}
-This Aegler-supplied 10½-ligne hand-wound family uses the 700/710 architecture. It has a straight-line lever escapement, monometallic Superbalance adjusted to six positions, self-compensating Breguet balance spring, and swan-neck micrometer regulator, with no documented shock protection. Antiquorum names Cal. 700 in its catalogue for ref. [[Reference:3358|3358]], case 51,419, with 18 jewels; its ref. [[Reference:2081|2081]] case 599,744 lot names the same caliber and grade but records 15 jewels. The discrepancy is unresolved, so the jewel count is left unspecified here. [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-225 Antiquorum, ref. 3358] [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-226 Antiquorum, ref. 2081] The movement powers the original Air-King 4925 and its Air-Lion, Air-Tiger, and Air-Giant siblings, including the sub-seconds 4365, mid-size 4444, and 4647 Hunter Precision. Its architecture links the pre-war Prince and Bubbleback movements with the post-war automatic Cal. 1030. Cal. 700 and 710 are hand-wound movements; Cal. 720 belongs to the automatic branch. White’s *The Vintage Rolex Field Manual* maps [[Reference:5031|ref. 5031]] to Cal. 710 in a reference table, but auction catalogues describe 5031 examples as automatic date watches. Christie’s [https://www.christies.com/en/lot/lot-204100 listing] records movement number 37519 but no caliber; Antiquorum’s [https://catalog.antiquorum.swiss/en/lots/rolex-lot-120-203 1995], [https://catalog.antiquorum.swiss/en/lots/rolex-lot-53-191 1999] and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-222-285 2009] entries do not name a caliber and report differing sizes and jewel counts. Sotheby’s 2020 and 2022 entries say only “automatic.” The available records do not resolve the conflict, so the 5031 is not assigned to Cal. 710, A.295, 740, or 745 here.
+This Aegler-supplied 10½-ligne hand-wound family uses the 700/710 architecture. It has a straight-line lever escapement, monometallic Superbalance adjusted to six positions, self-compensating Breguet balance spring, and swan-neck micrometer regulator, with no documented shock protection. Antiquorum names Cal. 700 in its catalogue for ref. [[Reference:3358|3358]], case 51,419, with 18 jewels; its ref. [[Reference:2081|2081]] case 599,744 lot names the same caliber and grade but records 15 jewels. The discrepancy is unresolved, so the jewel count is left unspecified here. [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-225 Antiquorum, ref. 3358] [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-226 Antiquorum, ref. 2081] The movement powers the original Air-King 4925 and its Air-Lion, Air-Tiger, and Air-Giant siblings, including the sub-seconds 4365, mid-size 4444, and 4647 Hunter Precision. Its architecture links the pre-war Prince and Bubbleback movements with the post-war automatic Cal. 1030. Cal. 700 and 710 are hand-wound movements; Cal. 720 belongs to the automatic branch. TimeAnagram lists Cal. 710 for a manual [[Reference:3121|ref. 3121]] and shows an open-movement photograph marked Rolex 15 Rubies and Superbalance, but no readable caliber number. Keep Cal. 710 as the seller’s attribution to that watch. White’s *The Vintage Rolex Field Manual* maps [[Reference:5031|ref. 5031]] to Cal. 710 in a reference table, but auction catalogues describe 5031 examples as automatic date watches. Christie’s [https://www.christies.com/en/lot/lot-204100 listing] records movement number 37519 but no caliber; Antiquorum’s [https://catalog.antiquorum.swiss/en/lots/rolex-lot-120-203 1995], [https://catalog.antiquorum.swiss/en/lots/rolex-lot-53-191 1999] and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-222-285 2009] entries do not name a caliber and report differing sizes and jewel counts. Sotheby’s 2020 and 2022 entries say only “automatic.” The available records do not resolve the conflict, so the 5031 is not assigned to Cal. 710, A.295, 740, or 745 here.
 Auction catalogues identify manual Cal. 710 in three ref. 6082 watches: Antiquorum cases 784516 and 721396, and Monaco Legend case 810693. Colin White’s reference table also pairs 6082 with Cal. 710. Antiquorum’s Hong Kong 2021 narrative calls case 721396 self-winding, while its movement field names Cal. 710. Kibble Watches and Watch.de assign Cal. 1210 to separate examples; Watch.de reports case 721965, a 1961 date and movement no. 1162170. Neither dealer listing provides a readable movement photograph, so these remain seller attributions. [[Reference:6082|The 6082 article]] keeps the conflicting records tied to individual watches.
@@ Line 906: / Line 908: @@
 The pallet fork runs in jewels, while the escape wheel has shock-mounted settings and cap jewels on both pivots, matching the treatment of the balance. Indirect centre seconds, driven from the fourth wheel through a friction-sprung pinion, can produce seconds-hand flutter even in a healthy movement. The earliest examples may lack shock protection; Antiquorum's 1946 ref. 4560 description names none.
 Documented fitments include refs. 3745, 4560, 6420, 6422, 6426/6427, 6466, 6480, 6482, 6494, 9083 and 9659. Bonhams also records a ref. 6694 with a III.60 caseback date on Cal. 1210.
 <span id="cal-1215"></span>
@@ Line 1,148: / Line 1,150: @@
 |}
-Cal. 1030 is a bidirectionally wound automatic used in 1950s Oyster references. Its 5.85mm profile ended the domed Bubbleback caseback, while the cutaway "butterfly" rotor stamped ROLEX PERPETUAL PATENTED is the usual visual identifier. Finishing includes perlage on the rhodium-plated main plate, brushed bridges, polished screw heads and red anodized-aluminium reversing wheels. A conventional index regulates the movement; the visible regulator arm distinguishes it from the later free-sprung 1560 and 1570. Documented fitments include ref. 6098 from 1952 and Oyster Perpetual 6567 from the 1950s, Submariners 6536, 6536-1 and 6538, Explorer 6610 and Air-King 6552. The same movement appeared in chronometer and non-chronometer watches.
+Cal. 1030 is a bidirectionally wound automatic used in 1950s Oyster references. Its 5.85mm profile ended the domed Bubbleback caseback, while the cutaway "butterfly" rotor stamped ROLEX PERPETUAL PATENTED is the usual visual identifier. Finishing includes perlage on the rhodium-plated main plate, brushed bridges, polished screw heads and red anodized-aluminium reversing wheels. A conventional index regulates the movement; the visible regulator arm distinguishes it from the later free-sprung 1560 and 1570. Documented fitments include ref. 6098 from 1952, Oyster Perpetual 6502 and 6567, Submariners 6536, 6536-1 and 6538, Explorer 6610 and Air-King 6552. Artcurial, Antiquorum and Sotheby’s catalogue 6502 examples with Cal. 1030; Watch-Wiki independently lists the association. The case 36701 records conflict: the Invaluable archive of Monaco Legend labels it 6502, while Phillips identifies that case as 6603. The competing catalogue attributions leave its reference unresolved. [https://www.invaluable.com/auction-lot/rolex-oyster-perpetual-ref-6502-honeycomb-dial-166-c-8e042b2aae Invaluable archive of Monaco Legend, lot 166]; [https://www.phillips.com/detail/rolex/134192 Phillips, lot 254] The Field Manual and several auction catalogues identify Cal. 1030 in Oyster Perpetual 6567 examples; Ineichen lists Cal. 1050 for one 6567. Other catalogues assign Cal. 1050 to refs. 6564, 6569 and Submariner 6536/1. These are descriptions of individual watches; the Cal. 1050 entry records the competing attributions.
 <span id="cal-1035"></span>
@@ Line 1,220: / Line 1,222: @@
 Antiquorum and Dr. Crott report that a 1960 Rolex catalogue proposed ref. 1020 as a successor to the 6556 and that the model was never produced. Neither source reproduces the catalogue page in the reviewed listing; this remains an attributed historical note. No production caliber or fitment is established for 1020, so it is not indexed as a movement.
+<span id="cal-1050"></span>
+=== Cal. 1050 ===
+{| class="wikitable" style="width:280px; font-size:90%;"
+! detail
+! value
+|-
+| type
+| Automatic, as described in the cited catalogues
+|-
+| jewels
+| 25 in the Antiquorum 6564, Bonhams 6569, and Christie's 6536/1 descriptions
+|-
+| catalogue attributions
+| Oyster Perpetual refs. 6564, 6567 and 6569; Submariner ref. 6536/1
+|}
+Several auction catalogues identify Cal. 1050 in watches dated to the 1950s. Antiquorum names it in a ref. 6564; Bonhams in a ref. 6569; Christie's in a Submariner 6536/1; and Ineichen in a ref. 6567. The 6564 and 6567 also appear in records naming Cal. 1030. These are catalogued assignments to individual watches. Cal. 1050’s technical relationship to Cal. 1030 and any changeover sequence remain unresolved. [https://catalog.antiquorum.swiss/en/lots/rolex-lot-63-114 Antiquorum, ref. 6564, lot 114] [https://images3.bonhams.com/original?src=Images%2Flive%2F2015-04%2F23%2FS-22886-0-1.pdf Bonhams, ref. 6569, lot 312] [https://www.christies.com/lot/lot-rolex-a-rare-stainless-steel-automatic-wristwatch-5892833/ Christie's, Submariner ref. 6536/1] [https://ineichen.com/auctions/timed-83/4/ Ineichen, ref. 6567, lot 4]
 <span id="cal-1530"></span>
@@ Line 1,443: / Line 1,463: @@
 Gardiner Houlgate catalogues Cal. 1560 in one ref. 1023, serial 1136xxx, dated circa 1964. Time Connection II’s replacement-parts table lists both Cal. 1560 and 1570 under the reference, without dates or a sequence. The auction record documents one Cal. 1560 example; it does not establish when either caliber entered production.
-Auction catalogues also identify Cal. 1560 in ref. 1024 examples dated circa 1965/66 and circa 1970. Antiquorum lists Cal. 1560 in a ref. 1011 dated 1960, case 546423, and in two lots jointly catalogued as refs. 1010/1011, dated 1960 and 1962. Heritage also lists Cal. 1560 in an undated ref. 1011 sold in 2012. Heritage and Bonhams list Cal. 1560 in individual ref. 1010 lots dated circa 1962 and circa 1967; Antiquorum lists Cal. 1570 in an individual ref. 1010 circa 1968. The Field Manual lists Cal. 1560 for ref. 1010. A 1stDibs item text also names Cal. 1560 for its claimed 1010, though the page title says 1011; treat it as seller-level evidence. These records document both attributions for ref. 1010, and its changeover year remains open; see [[Reference:1010|ref. 1010]]. Antiquorum also catalogues Cal. 1560 in a 1963 ref. 1501, case 953,774; see [[Reference:1501|ref. 1501]] and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-247-67 the lot record].
+Auction catalogues also identify Cal. 1560 in ref. 1024 examples dated circa 1965/66 and circa 1970. Antiquorum lists Cal. 1560 in a ref. 1011 dated 1960, case 546423, and in two lots jointly catalogued as refs. 1010/1011, dated 1960 and 1962. Heritage also lists Cal. 1560 in an undated ref. 1011 sold in 2012. Heritage and Bonhams list Cal. 1560 in individual ref. 1010 lots dated circa 1962 and circa 1967; Antiquorum lists Cal. 1570 in an individual ref. 1010 circa 1968. The Field Manual lists Cal. 1560 for ref. 1010. A 1stDibs item text also names Cal. 1560 for its claimed 1010, though the page title says 1011; treat it as seller-level evidence. These records document both attributions for ref. 1010, and its changeover year remains open; see [[Reference:1010|ref. 1010]]. Antiquorum catalogues Cal. 1560 in ref. 1501 examples dated 1962 (case 761,220) and 1963 (case 953,774); see [[Reference:1501|ref. 1501]], [https://catalog.antiquorum.swiss/en/lots/rolex-ref-1501-oyster-perpetual-date-lot-386-200 the 1962 lot], and [https://catalog.antiquorum.swiss/en/lots/rolex-lot-247-67 the 1963 lot].
 The Vintage Rolex Field Manual assigns Cal. 1560 to proposed monopusher refs. 1074 and 1223, but cites no identified watch or movement evidence for either link. [https://watchguy.co.uk/tmp/Rolex%201560.pdf Rolex’s standard Cal. 1560 parts sheet] describes a self-winding, sweep-seconds movement and does not document chronograph works. Christie’s catalogues two 1074 wristwatches without naming a caliber. A separate [https://www.christies.com/en/lot/lot-204177 Christie’s 1920s monopusher listing] gives 1223 as the case number, not as a verified reference; a [https://www.christies.com/en/lot/lot-6049981 ref. 28D1 pocket chronograph] uses 1223 as its movement number. Treat both Field Manual caliber assignments as unverified. [https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, printed p. 74] [https://www.christies.com/en/lot/lot-874668 Christie’s, model 1074] [https://www.christies.com/en/lot/lot-1473066 Christie’s, ref. 1074 case 25433]
@@ Line 2,131: / Line 2,151: @@
 |}
-Christie’s lists Cal. 1080 in 6543 case 145'111. Revolution also assigns the caliber to the 6543 and describes a Cal. 1030 relationship. Sotheby’s called movement N726507 in 6541 case 412'479 Cal. 1080 in 2018; Phillips listed the same case and movement number as Cal. 1055 in 2026. The surviving catalogues document these watch-level labels, not a settled specification or changeover sequence.
+Christie’s lists Cal. 1080 in 6543 case 145'111. Revolution and Watch-Wiki also assign the caliber to the 6543; Revolution describes a Cal. 1030 relationship. Watch-Wiki is a secondary reference index, and it does not resolve Christie’s Cal. 1065 label for case 145'159. Sotheby’s called movement N726507 in 6541 case 412'479 Cal. 1080 in 2018; Phillips listed the same case and movement number as Cal. 1055 in 2026. The surviving records do not establish a caliber sequence.
 <span id="cal-1580"></span>
@@ Line 2,689: / Line 2,709: @@
 |}
-Cal. 1055 is documented in the first four-digit Day-Date references, from 1956 to 1959: refs. 6510, 6511, 6611, 6612 and 6613. Its rhodium-plated bridges carry oeil-de-perdrix ("partridge-eye") circular graining rather than Côtes de Genève. Documented examples were adjusted to temperature and five positions.
+Cal. 1055 appears in catalogues for the first four-digit Day-Date references and is commonly dated 1956–1959. A 2017 Dorotheum listing pairs it with a 6511/8 dated circa 1965; Pergola’s unofficial chart places the case number in its 1956 band, and the lot photo has no readable serial. Treat the later date as an unresolved catalogue attribution. Cal. 1055 has rhodium-plated bridges with oeil-de-perdrix ("partridge-eye") circular graining rather than Côtes de Genève. Documented examples were adjusted to temperature and five positions.
 Reference histories commonly date the 6611 to 1957 and associate it with the second, chronometer-certified 1055 generation. Phillips lists caliber 1055 on its 1956 gold 6611 and 1055B on its 1958 white-gold 6611B; catalogues do not use the suffix consistently. The dial wording changes to “Superlative Chronometer Officially Certified.”
@@ Line 2,701: / Line 2,721: @@
 Steel school-watch records create a separate problem: Antiquorum lists 1556 for a 2002 lot and 1066 for a 2013 lot, while Phillips describes later steel Day-Date prototypes with 1555-series movements. These are catalogue descriptions of disputed school/prototype watches, not confirmed 6611 production fitments. See [[Reference:6611|the 6611 record]] for the lot-level distinctions.
-Auction catalogues also disagree on the movement fitted to ref. 6511. Phillips lists Cal. 1555 for case 111,654; Phillips lot 41, Antiquorum lot 81, Bonhams lot 156, and Monaco Legend lots 22 and 220 list Cal. 1055. The lot descriptions do not establish whether the 1555 label is a mistake or a later movement. Keep the attribution attached to the individual lot.
+Auction catalogues disagree on the movement fitted to ref. 6511. Phillips lists Cal. 1555 for case 111,654, and Dorotheum lists Cal. 1555 for case 166736. Phillips lot 41, Antiquorum lot 81, Bonhams lot 156, Monaco Legend lots 22 and 220, and Dorotheum's 2017 lot for case 166744 list Cal. 1055. Phillips dates Cal. 1555 to 1959, later than the dates assigned to both 1555-labelled cases. The 2017 Dorotheum listing dates case 166744 circa 1965, while Pergola's unofficial chart puts the number in its 1956 band. Its front-view image offers no readable serial, leaving the two dates in conflict. Each entry is a catalogue attribution; keep it attached to its lot pending inspection of the movement.
 <span id="cal-1555"></span>
@@ Line 3,027: / Line 3,047: @@
 * [https://www.phillips.com/detail/rolex/138071 Phillips, ref. 6609 case 355605, Cal. 1065]
 * [https://catalog.antiquorum.swiss/en/lots/rolex-lot-108-63 Antiquorum, ref. 6567, 1956, Cal. 1030]
+* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-63-114 Antiquorum, 2000, ref. 6564, Cal. 1050]
+* [https://ineichen.com/auctions/timed-83/4/ Ineichen, 2025, ref. 6567, Cal. 1050]
+* [https://images3.bonhams.com/original?src=Images%2Flive%2F2015-04%2F23%2FS-22886-0-1.pdf Bonhams, 2015, ref. 6569, Cal. 1050]
+* [https://www.christies.com/lot/lot-rolex-a-rare-stainless-steel-automatic-wristwatch-5892833/ Christie's, circa 1955, Submariner ref. 6536/1, Cal. 1050]
 * [https://www.adams.ie/W103-lot-33-ROLEX-REF-1022-OYSTER-PERPETUAL-18K-YELLOW-GOLD-FLORENTINE-FINISH-CASE-A?auction_no=W103&page_no=3&sort_by=lot_no Adams, ref. 1022, 2025, Cal. 1560]
 * [https://images3.bonhams.com/original?src=Images%2Flive%2F2015-04%2F23%2FS-22886-0-1.pdf Bonhams, ref. 1022, 2015, Cal. 1560]
@@ Line 3,041: / Line 3,065: @@
 * [https://www.phillips.com/detail/rolex/CH080115/40 Phillips, 2015, ref. 6511 case 111,654, movement listed as 1555]
+* [https://www.dorotheum.com/en/l/10072651/ Dorotheum, 2026, ref. 6511 case 166736, movement listed as 1555]
+* [https://www.dorotheum.com/de/l/604595/ Dorotheum, 2017, ref. 6511/8 case 166744, movement listed as 1055]
+* [https://www.phillips.com/detail/rolex/CH080219/247 Phillips, Cal. 1555 chronology and experimental steel Day-Date]
 * [https://www.phillips.com/detail/rolex/CH080115/41 Phillips, 2015, ref. 6511 case 134,692, movement listed as 1055]
 * [https://www.phillips.com/detail/rolex/CH080115/50 Phillips, 2015, 6611 case 214,124, caliber 1055]
@@ Line 3,097: / Line 3,124: @@
 * [https://www.christies.com/lot/lot-5612347 Christie’s, ref. 6543 case 145'159, Cal. 1065]
 * [https://revolutionwatch.com/rolex-milgauss-one-in-a-thousand/ Revolution, Milgauss movement and 6543 history]
+* [https://www.watch-wiki.net/doku.php?id=Rolex_calibres Stephen Foskett, Watch-Wiki Cal. 1080 reference index for 6543]
 * [https://www.sothebys.com/en/auctions/ecatalogue/2018/important-watches-n09952/lot.256.html Sotheby’s, 6541 case 412'479, Cal. 1080]
 * [https://www.phillips.com/detail/rolex/206388 Phillips, same case and movement number, Cal. 1055]
@@ Line 3,120: / Line 3,148: @@
 * [https://www.watchrepairtalk.com/topic/28412-rolex-3135-510-drive-wheel-for-ratchet-appears-to-be-worn-not-winding-watch-enough/ Watch Repair Talk — Rolex 3135-510 ratchet drive wheel wear]
 * [https://catalog.antiquorum.swiss/en/lots/rolex-ref-3121-oyster-grenfell-lot-376-219 Antiquorum Geneva, 3 April 2025, lot 219]: ref. 3121 Oyster Grenfell, case 43,475, circa 1938, Cal. 59, 17 jewels.
+* [https://timeanagram.com/products/7507 TimeAnagram, item 7507]: ref. 3121 listed as manual Cal. 710; the movement image shows no readable caliber stamp.
 * ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra
 * [https://watchguy.co.uk/tmp/Rolex%201560.pdf Rolex Cal. 1560 spare-parts sheet no. 31; scan hosted by WatchGuy]