Reference:Movements: Difference between revisions

|description=Cross-family caliber catalogue for vintage and discontinued Rolex watches, with selected modern lineages through the 2023 Explorer II and Daytona transitions.

<div class="rp-era"><div class="rp-era-name">Prince (shaped)</div><div class="rp-chips">[[#cal-300|300]] [[#cal-300-ts|7½ T.S. 300]] [[#cal-310|310]] [[#cal-360-hw|360 HW]] [[#cal-350-ts|350 T.S.]] [[#cal-1759|1759]]</div></div>

<div class="rp-era"><div class="rp-era-name">Bubbleback / early automatic</div><div class="rp-chips">[[#cal-520|520]] [[#cal-50|50]] [[#cal-620|620]] [[#cal-630|630]] [[#cal-635|635]] [[#cal-105-hunter|700/710]] [[#cal-600|600]] [[#cal-59|59]] [[#cal-a260|A260]] [[#cal-a296|A296]] [[#cal-a295|A.295]] [[#cal-645|645]] [[#cal-740|740]] [[#cal-745|745]]</div></div>

<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">Vintage sport (1950s–80s)</div><div class="rp-chips">[[#cal-1030|1030]] [[#cal-1035|1035]] [[#cal-1036|1036]] [[#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>

<div class="rp-era"><div class="rp-era-name">Early chronograph</div><div class="rp-chips">[[#cal-13|13]]</div></div>

<div class="rp-era"><div class="rp-era-name">Daytona chronograph</div><div class="rp-chips">[[#cal-72|72]] [[#cal-72a|72A]] [[#cal-72b|72B]] [[#cal-722|722]] [[#cal-722-1|722-1]] [[#cal-727|727]] [[#cal-4030|4030]] [[#cal-4130|4130]] [[#cal-4131|4131]] [[#cal-4132|4132]]</div></div>

<div class="rp-era"><div class="rp-era-name">Day-Date</div><div class="rp-chips">[[#cal-1055|1055]] [[#cal-1555|1555]] [[#cal-1556|1556]] [[#cal-1566|1566]] [[#cal-3055|3055]] [[#cal-3155|3155]] [[#cal-3156|3156]] [[#cal-3255|3255]]</div></div>

[[File:Cal 300 movement.webp|thumb|right|220px|Cal. 300, Extra Prima grade, rectangular Prince architecture, Bonhams lot photo|alt=Cal. 300, Extra Prima grade, rectangular Prince architecture, Bonhams lot photo]]

Several UK auction catalogues treat the three- and four-digit numbers found on movements in refs 1862, 1490, and 1855 as calibers. The documented numbers are 510, 579, 841, 1004, 1130, and 1439, with weaker evidence for 701 and a single record of 1759. They are almost certainly movement serials read from the plate. Continental catalogues identify the same movement class by grade and the T.S. size code instead. Cal. 414 and Cal. 527 have no documented connection to the Rolex Prince. The number 971A is a Prince case reference, not an established caliber designation; Antiquorum catalogued that reference in 1989 with a T.S./300-family movement. Fabsuisse labels the movement in its separate ref. 3937 dealer listing “Cal. 971A,” but the auction records reviewed here do not confirm that designation. Treat it as an unverified dealer attribution unless a readable movement marking supports it.

[[File:Cal 300 TS movement.webp|thumb|right|220px|Cal. 7½′′′ T.S. 300, marked "Rolex World's Records," "Rolex Chronometer," "18 Rubies, Ultra Prima"|alt=Cal. 7½′′′ T.S. 300, marked "Rolex World's Records," "Rolex Chronometer," "18 Rubies, Ultra Prima"]]

[[File:Cal 360 HW movement.webp|thumb|right|220px|Cal. 360 HW, marked "Rolex, 15 Rubies, Swiss Made"|alt=Cal. 360 HW, marked "Rolex, 15 Rubies, Swiss Made"]]

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]

[[File:Cal 1759 movement.webp|thumb|right|220px|Cal. 1759, "1759, 18 RUBIES, ULTRA PRIMA," with its matching case back|alt=Cal. 1759, "1759, 18 RUBIES, ULTRA PRIMA," with its matching case back]]

[[File:Cal 350 TS movement.webp|thumb|right|220px|Cal. 350 T.S., Extra Prima grade, 15 rubies, timed to 6 positions, in a ref. 1491 jumping hour|alt=Cal. 350 T.S., Extra Prima grade, 15 rubies, timed to 6 positions, in a ref. 1491 jumping hour]]

| 17 (registry; 19 in some auction descriptions)

[[File:Cal 620 movement.webp|thumb|right|220px|Cal. 620, EmmyWatch|alt=Cal. 620, EmmyWatch]]

The rotor is a unidirectional "Perpetual" type that turns through 360 degrees without bumpers or buffers. It is engraved "ROLEX PERPETUAL / CHRONOMETER / SWISS MADE / PATENTED / SUPER-BALANCE," while the three-screw, 18mm cover plate reads "VIS TIRETTE / PATENTED / TRIGGER SCREW." Cal. 620 powered early Bubblebacks. Rolex dates the introduction of its Perpetual rotor to 1931, but that historical account does not name the caliber. Cal. 630 and the related 635 and 645 developed from the same architecture.

 

Reference [[Reference:3134|3134]] has both subsidiary- and centre-seconds examples, but its published catalogues do not name a caliber. Do not assign a 620/635 or 630/645 to a particular watch from its seconds layout alone; confirm the movement marking. See the reference article for the lot-level evidence.

[[File:Cal 630 movement.webp|thumb|right|220px|Cal. 630, EmmyWatch|alt=Cal. 630, EmmyWatch]]

[[File:Cal 700 movement.webp|thumb|right|220px|Cal. 700, the 10½-ligne Hunter, monometallic Superbalance, shown in its Oyster case|alt=Cal. 700, the 10½-ligne Hunter, monometallic Superbalance, shown in its Oyster case]]

| 15–18

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.

 

 

Auction catalogues describe compatible 10- to 10½-ligne manual movements in [[Reference:2765|2765]], [[Reference:2595|2595]] and [[Reference:3009|3009]], but none of the surfaced records shows a Cal. 700 stamp. All three reference pages therefore treat the assignment as plausible rather than confirmed. The eight catalogue entries for [[Reference:1873|1873]] identify manual movements with 15–18 jewels and Extra Prima or Ultra Prima grades; the entries give no caliber designation.

Two Antiquorum catalogues from 1989 describe ref. [[Reference:3003|3003]] and [[Reference:3004|3004]] movements as 10-line, 15- and 17-jewel examples respectively. Neither entry names a caliber. These lot descriptions do not confirm Cal. 700 or 710 fitment in either reference.

[[File:Cal 600 movement.webp|thumb|right|220px|Cal. 600, manual, Super Balance — EmmyWatch|alt=Cal. 600, manual, Super Balance — EmmyWatch]]

Unlike the Aegler-built 10½-ligne Hunter family above, Cal. 59 is a bought-in movement: David Boettcher's research on Oyster Watch Co. identifies it as a rebadged Fontainemelon FHF 30 ébauche, the same base Rolex carried over to Tudor as its own Cal. 59 after Tudor's 1946 incorporation. Four auction-catalogued [[Reference:3478|3478]] watches, three from Bonhams and one from Antiquorum, name Cal. 59 directly. That is firmer evidence than the Cal. 700/710 assignments below, which remain family-level matches rather than photographed or catalogued stamps.

[[File:Cal A260 movement.webp|thumb|right|220px|Cal. A260-era movement, engraved Rolex Self Winder, Jewels, Patented|alt=Cal. A260-era movement, engraved Rolex Self Winder, Jewels, Patented]]

A260 powered the first Submariner references, 6204 and 6205, from 1953 to 1955. "A.260" is Rolex's size-family code for this movement class, comparable to the Prince family's "T.S." code. Its non-butterfly rotor distinguishes it from the butterfly-rotor Cal. 1030. Hodinkee traces A260 to a movement used in earlier Oyster Perpetuals and later Bubblebacks, predating its Submariner fitment. The registry uses 17 jewels; some auction descriptions give 19, so the count should be checked against the individual movement.

[[File:Cal A296 movement.webp|thumb|right|220px|Cal. A296-era rotor component, engraved Rolex Perpetual Chronometer|alt=Cal. A296-era rotor component, engraved Rolex Perpetual Chronometer]]

| 17 (registry; 18–19 in catalogues, depending on module counting)

Catalogues place A296 in the early 1950s, with the registry using a working window of 1953–1956. It powered the Big Crown 6200, early Explorers 6098, 6150 "Precision," 6298, and 6350, and early Datejusts 6104 and 6105. Phillips also identifies A.296 in one 6075, case 714440; other auction catalogues name A.295 in 6075 cases. That conflict is attached to the reference page rather than treated as a universal movement rule. Its full rotor winds in one direction; it is not a bumper caliber. The 6150 and 6350 use related movements in non-chronometer and chronometer-rated watches. COSC itself was founded later, in 1973. "A.296" is Rolex's size-family code and 775 its commercial number, so listings may use either designation for the same movement. Cal. 1030 replaced it in the mid-1950s with bidirectional winding, a butterfly rotor, and a thinner automatic module. Phillips identifies that reduced thickness as the change that eliminated the domed Bubbleback caseback.

[[File:Cal 645 movement.webp|thumb|right|220px|Cal. 645 winding bridge, engraved "Rolex Perpetual Chronometer, Super-Balance, Patented" — EmmyWatch|alt=Cal. 645 winding bridge, engraved "Rolex Perpetual Chronometer, Super-Balance, Patented" — EmmyWatch]]

[[File:Cal 740 movement.webp|thumb|right|220px|Cal. 740 in a reference 4467 Datejust, case back removed, rotor engraved "Rolex Perpetual Chronometer, Super Balance, Vis Tirette"|alt=Cal. 740 in a reference 4467 Datejust, case back removed, rotor engraved "Rolex Perpetual Chronometer, Super Balance, Vis Tirette"]]

The 10&frac12;-ligne rhodium-plated movement has a straight-line lever escapement, Superbalance adjusted to six positions, and self-compensating Breguet balance spring. Some catalogues substitute "monometallic balance adjusted to 6 positions" for Superbalance, as they do for Cal. 645. No Cal. 740 description names the regulator. Antiquorum describes an index regulator on its A.295-attributed ref. 6075, case 714441 ([2014 lot 107](https://catalog.antiquorum.swiss/en/lots/rolex-ref-6075-lot-283-107)); that is a separate catalogue attribution, not evidence that A.295 and Cal. 740 are interchangeable names.

[[File:Cal 745 movement.webp|thumb|right|220px|Cal. 745, gilt rotor engraved "Rolex Perpetual Chronometer, Super Balance" — EmmyWatch|alt=Cal. 745, gilt rotor engraved "Rolex Perpetual Chronometer, Super Balance" — EmmyWatch]]

[[File:Cal 1210 movement.webp|thumb|right|220px|Cal. 1210 in a 1960 Oysterdate Precision ref. 6466, movement in case|alt=Cal. 1210 in a 1960 Oysterdate Precision ref. 6466, movement in case]]

| KIF-pattern on documented later examples; earliest examples may lack protection

[[File:Cal 1215 movement.webp|thumb|right|220px|Cal. 1215 in a movement holder, from a 1962 Oyster Date Precision ref. 6694 service|alt=Cal. 1215 in a movement holder, from a 1962 Oyster Date Precision ref. 6694 service]]

Christie's places the ref. 6494 changeover between a circa-1956 example with Cal. 1210 and a circa-1958 example with 1215. Other documented fitments include the Speedking 6430, early 6694 production, and refs. 9996/9919.

 

 

[[File:Cal 1225 movement.webp|thumb|right|220px|Cal. 1225 in a ref. 6694 Oysterdate Precision, bridges marked "Montres Rolex S.A. Swiss"|alt=Cal. 1225 in a ref. 6694 Oysterdate Precision, bridges marked "Montres Rolex S.A. Swiss"]]

[[File:Cal 1200 movement.webp|thumb|right|220px|Cal. 1200, bridges marked "Montres Rolex S.A. Geneva Swiss, Seventeen 17 Jewels", from a Rolex Precision service|alt=Cal. 1200, bridges marked "Montres Rolex S.A. Geneva Swiss, Seventeen 17 Jewels", from a Rolex Precision service]]

[[File:Cal 1030 movement.webp|thumb|right|220px|Cal. 1030, engraved "1030," 25 jewels, butterfly rotor|alt=Cal. 1030, engraved "1030," 25 jewels, butterfly rotor]]

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.

[[File:Cal 1035 movement.webp|thumb|right|220px|Cal. 1035, rotor engraved "Rolex Perpetual Patented" — EmmyWatch|alt=Cal. 1035, rotor engraved "Rolex Perpetual Patented" — EmmyWatch]]

[[File:Cal 1530 butterfly rotor.webp|thumb|right|220px|Cal. 1530-era butterfly rotor halves, Rolex coronet stamped|alt=Cal. 1530-era butterfly rotor halves, Rolex coronet stamped]]

| 42h (registry; 44h in some secondary tables)

| KIF, form-dependent (Flector or Elastor)

Cal. 1530 ran from 1957 to 1965. Its 17-, 25- and 26-jewel versions are concurrent market variants, not a chronological progression. Seventeen-jewel movements appear in a 1958-era ref. 5508 and a 5500, and Rolex’s Technical and Service Information, third edition, discusses the 1520 and 1530 families in its servicing instructions.

The 1530 first entered the Submariner in ref. 5508, followed by 5510; neither was chronometer-rated at launch. It replaced the 10-series in non-chronometer watches, including Precision models, the Air-King, ref. 5504 "Super-Precision" Explorer and the Canadian Explorer-Date with Cal. 1535. Certified models such as the 6542 GMT, 6610 Explorer, Datejust and Day-Date retained 10xx calibers for longer. Strongly documented fitments include refs. 5508, 5510, 5512, 5513, 5500 and 5504. Single-lot support exists for 5501, 5502, 5506 and 5516. Bonhams listings for refs. 1002 and 1003 are internally inconsistent and remain unconfirmed. Bonhams lot 84 lists caliber 1530 in ref. 1003 case 573,835 and notes a chronometer certificate dated 22 December 1960. The catalogue is the evidence for this individual attribution; it does not resolve why common reference tables omit the 1530 for 1003.

[[File:Cal 1520 movement.webp|thumb|right|220px|Cal. 1520, engraved "1520," EmmyWatch|alt=Cal. 1520, engraved "1520," EmmyWatch]]

[[File:Cal 1535 movement.webp|thumb|right|220px|Cal. 1535, EmmyWatch|alt=Cal. 1535, EmmyWatch]]

[[File:Cal 1525 movement.webp|thumb|right|220px|Cal. 1525, EmmyWatch|alt=Cal. 1525, EmmyWatch]]

Jewel counts of 17, 25 and 26 reflect parallel market executions. Rolex balance-assembly numbers confirm a flat hairspring for the 1520 and 1525, against a Breguet spring on the 1530 and Microstella on the 1560. The 1525 remains index-regulated. Waddington’s identifies Cal. 1520, 26 jewels, in a circa-1965 Eaton’s ¼ Century Club watch catalogued as ref. 1011, case 1,301,143. See [[Reference:1011|ref. 1011]].

[[File:Cal 1560 movement.webp|thumb|right|220px|Cal. 1560, EmmyWatch|alt=Cal. 1560, EmmyWatch]]

Cal. 1560 arrived in 1959 as the chronometer-grade 15xx movement, with a free-sprung balance adjusted to temperature and five positions. Auction catalogues give both 25 and 26 jewels without establishing a pattern. Antiquorum usually describes a Breguet overcoil; its flat-hairspring description for one ref. 1502/1503 is an outlier. The Oyster Perpetual ref. 1022 is documented with Cal. 1560 by Bonhams, Pandolfini, Adams, and HODINKEE; Tajan describes an automatic movement but names no caliber. 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. These records document both attributions; the changeover year remains open. See [[Reference:1010|ref. 1010]].

[[File:Cal 1565 movement.webp|thumb|right|220px|Cal. 1565, EmmyWatch|alt=Cal. 1565, EmmyWatch]]

| 42h (registry; 44h in some secondary tables)

[[File:Cal 1570 movement.webp|thumb|right|220px|Cal. 1570, open caseback|alt=Cal. 1570, open caseback]]

Cal. 1570 is the 19,800-vph revision of the 1560, introduced in 1965. Christie’s identifies Cal. 1570 in ref. 1011 case 692498, dated circa 1962; its lot chronology overlaps the ref. 1011 Cal. 1560 examples and does not establish a changeover. See [[Reference:1011|ref. 1011]]. One Artcurial ref. 1005 lot is catalogued with Cal. 1550, despite a chronometer-dial description; other 1005 catalogues list 1560 or 1570. This single lot does not establish a 1005 movement variant or resolve whether the movement is original. It retains the free-sprung Breguet overcoil and Microstella regulation, with adjustment to temperature and five positions. Family-wide bridge engraving causes date movements such as the 1575 in a ref. 1665 to appear marked 1570; the engraving alone does not identify the exact caliber. Phillips identifies Cal. 1570 in a circa-1985 ref. 1024, while Dorotheum lists it on a circa-1965/70 example; the auction dates overlap the Cal. 1560 records.

[[File:Cal 1575 movement.webp|thumb|right|220px|Cal. 1575, EmmyWatch|alt=Cal. 1575, EmmyWatch]]

Early GMT-Master movements synchronized the hour hands. Published references and auction catalogues name calibres 1030, 1036, 1065 and 1066 for the 6542; the sources do not give a consistent changeover chronology. Cal. 1565, 1575 and 3075 retained the synchronized, or "caller," layout through the 1675 and 16750 generations. Cal. 3085 introduced an independently adjustable local-hour hand. Cal. 3175 kept the synchronized layout in the 16700 until 1999, alongside calibres 3185 and 3186 in the 16710.

[[File:Cal 1036 movement.webp|thumb|right|220px|Cal. 1036, EmmyWatch|alt=Cal. 1036, EmmyWatch]]

The Field Manual lists Cal. 1036 for the 6542, and Monochrome describes it as a Cal. 1030 with a 24-hour train. Sotheby's catalogues identify several individual 6542s with Cal. 1030, while other lots name 1065 or 1066. These attributions leave the 1036's place in the reference's production run unresolved. Period chronometer certificates came from the Bureaux Officiels; COSC began in 1973.

Published chronologies differ: a Phillips catalogue essay dates the 6542 release to 1954, while Rolex places the GMT-Master in 1955. The relationship between those dates remains unresolved in the cited sources.

[[File:Cal 1065 movement.webp|thumb|right|220px|Cal. 1065, EmmyWatch|alt=Cal. 1065, EmmyWatch]]

Auction catalogues identify Cal. 1065 in individual 6542 examples as an automatic movement with 25 jewels. The Field Manual also lists it for the reference. Those records establish the attribution to examples; they leave its production dates and position relative to calibres 1030, 1036 and 1066 open. Published 42-hour reserve figures come from secondary sources.

[[File:Cal 1066 movement.webp|thumb|right|220px|Cal. 1066, stamped "1066," butterfly rotor engraved "Rolex Perpetual Patented," EmmyWatch|alt=Cal. 1066, stamped "1066," butterfly rotor engraved "Rolex Perpetual Patented," EmmyWatch]]

Auction catalogues identify Cal. 1066 in steel and gold 6542 examples, including watches dated circa 1958 and 1959. The Field Manual lists the caliber for the reference as well. Its published specification is 18,000 vph and 25 jewels; Antiquorum describes a straight-line lever escapement, monometallic balance adjusted to temperature and five positions, shock absorber, and self-compensating Breguet hairspring. The available records place Cal. 1066 in late examples, but do not establish it as the final fitment or date a change from Cal. 1065.

Published examples dated circa 1958 and 1959 carry different movement labels. A steel watch has a IV.1958 caseback; auction catalogues date two gold watches to 1959. These individual records show more than one caliber in late examples.

[[File:Cal 3075 movement.webp|thumb|right|220px|Cal. 3075, engraved "3075," EmmyWatch|alt=Cal. 3075, engraved "3075," EmmyWatch]]

[[File:Cal 3085 movement.webp|thumb|right|220px|Cal. 3085, EmmyWatch|alt=Cal. 3085, EmmyWatch]]

[[File:Cal 3175 movement.webp|thumb|right|220px|Cal. 3175, EmmyWatch|alt=Cal. 3175, EmmyWatch]]

[[File:Cal 3185 movement.webp|thumb|right|220px|Cal. 3185, engraved "3185"|alt=Cal. 3185, engraved "3185"]]

Published Cal. 3085 thickness figures span 6.3 to 7.2mm. Cal. 3185 is 6.45mm, so it is thinner than the thicker 16760 specification but not every published 3085 measurement. That helped the 16710 sit flatter than the "Fat Lady" 16760. During setting, the 24-hour hand may twitch as the local hour jumps; this is a screening clue, not proof of caliber identity.

[[File:Cal 3186 movement.webp|thumb|right|220px|Cal. 3186, engraved "3186"|alt=Cal. 3186, engraved "3186"]]

[[File:Cal 3187 movement.webp|thumb|right|220px|Cal. 3187, official Rolex photo, engraved "3187," blue Parachrom hairspring, free-sprung Microstella balance|alt=Cal. 3187, official Rolex photo, engraved "3187," blue Parachrom hairspring, free-sprung Microstella balance]]

Cal. 3187 is an enlarged Cal. 3186, widened to move the date window outward in the 42mm Explorer II case. It powered only the 216570 from 2011 to 2021, before Cal. 3285 replaced it in the 226570. The Parachrom hairspring, Breguet overcoil, and independently adjustable local-hour hand carry over from the GMT lineage. Paraflex is new here, replacing the KIF Elastor used by Cal. 3185. Within the GMT and Explorer II lineage covered on this page, Cal. 3187 is the first entry listed with Paraflex.

== Modern sport calibers (1988–2023 coverage) ==

[[File:Cal 3000 movement.webp|thumb|right|220px|Cal. 3000|alt=Cal. 3000]]

[[File:Cal 3035 movement.webp|thumb|right|220px|Cal. 3035, engraved "3035," EmmyWatch|alt=Cal. 3035, engraved "3035," EmmyWatch]]

[[File:Cal 3130 movement.webp|thumb|right|220px|Cal. 3130, engraved "3130," EmmyWatch|alt=Cal. 3130, engraved "3130," EmmyWatch]]

[[File:Cal 3132 movement.webp|thumb|right|220px|Cal. 3132|alt=Cal. 3132]]

The base architecture remains a straight-line lever escapement with a free-sprung Glucydur balance under a full bridge, Microstella regulation, and no index. Paraflex replaced the 3130's KIF Elastor settings; Rolex's published material claims up to 50 per cent greater shock resistance than KIF. That comparison is a manufacturer claim, not an independent test. The blue Parachrom hairspring replaced Nivarox with a paramagnetic niobium-zirconium alloy whose colour comes from a patented oxide treatment.

[[File:Cal 3135 movement.webp|thumb|right|220px|Cal. 3135, official Rolex photo, engraved "3135," 31 jewels|alt=Cal. 3135, official Rolex photo, engraved "3135," 31 jewels]]

Auction catalogues assign Cal. 1080 to early Milgauss examples, though a later catalogue labels the same 6541 movement number Cal. 1055. Cal. 1580 derives from the 1530 platform; Cal. 3131 derives from Cal. 3130.

 

 

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.

[[File:Cal 1580 movement.webp|thumb|right|220px|Cal. 1580, marked "26 Jewels, Adjusted Six 6 Positions" — EmmyWatch|alt=Cal. 1580, marked "26 Jewels, Adjusted Six 6 Positions" — EmmyWatch]]

[[File:Cal 3131 movement.webp|thumb|right|220px|Cal. 3131 from a Milgauss 116400GV, auto bridge and gold reversing wheels|alt=Cal. 3131 from a Milgauss 116400GV, auto bridge and gold reversing wheels]]

[[File:Cal 72 movement.webp|thumb|right|220px|Valjoux 72 ébauche, caliber "72" stamped at 6 o'clock beside the Valjoux logo, plate marked "Seventeen 17 Jewels Unadjusted," stock index regulator with F/A–S/R scale — the untouched configuration Rolex fitted as Cal. 72. This example's chronograph bridge is signed Heuer-Leonidas SA|alt=Valjoux 72 ébauche, caliber "72" stamped at 6 o'clock beside the Valjoux logo, plate marked "Seventeen 17 Jewels Unadjusted," stock index regulator with F/A–S/R scale — the untouched configuration Rolex fitted as Cal. 72. This example's chronograph bridge is signed Heuer-Leonidas SA]]

[[File:Cal 72B movement.webp|thumb|right|220px|Rolex-signed Valjoux 72-family movement, seventeen jewels — caliber sub-variant not distinguishable from the engraving alone|alt=Rolex-signed Valjoux 72-family movement, seventeen jewels — caliber sub-variant not distinguishable from the engraving alone]]

[[File:Cal 722 movement.webp|thumb|right|220px|Rolex-signed Valjoux 72-family movement, seventeen jewels — caliber sub-variant not distinguishable from the engraving alone|alt=Rolex-signed Valjoux 72-family movement, seventeen jewels — caliber sub-variant not distinguishable from the engraving alone]]

[[File:Cal 722-1 movement.webp|thumb|right|220px|Rolex-signed Valjoux 72-family movement, seventeen jewels — caliber sub-variant not distinguishable from the engraving alone|alt=Rolex-signed Valjoux 72-family movement, seventeen jewels — caliber sub-variant not distinguishable from the engraving alone]]

[[File:Cal 727 movement.webp|thumb|right|220px|Cal. 727 (right, engraved 727, Daytona ref 6265), specialist comparison photo via Perezcope|alt=Cal. 727 (right, engraved 727, Daytona ref 6265), specialist comparison photo via Perezcope]]

[[File:Cal 4030 movement.webp|thumb|right|220px|Cal. 4030, engraved 4030, thirty-one jewels|alt=Cal. 4030, engraved 4030, thirty-one jewels]]

[[File:Cal 4130 movement.webp|thumb|right|220px|Cal. 4130 movement detail, bridge marked "4130"|alt=Cal. 4130 movement detail, bridge marked "4130"]]

Cal. 4130 was developed and manufactured by Rolex for the ref. 116520 in 2000. [https://www.rolex.com/en-us/about-rolex/history/2000-2013 Rolex history, 2000–2013] Its column wheel and vertical clutch avoid the hand jump reported for Cal. 4030 when the chronograph starts. The movement uses 201 components, about 20 per cent fewer than its predecessor, and twelve types of screw rather than more than forty.

 

 

 

 

 

 

 

 

 

 

 

 

 

Day-Date calibers form their own family. Four-digit references set both calendar displays through the hands; five-digit references introduced quickset.

 

<span id="cal-1055"></span>

=== Cal. 1055 ===

[[File:Cal 1055 movement.webp|thumb|right|220px|Cal. 1055, period parts-catalogue illustration, front and back|alt=Cal. 1055, period parts-catalogue illustration, front and back]]

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

! detail

! value

|-

| type

| Automatic

|-

| jewels

| 25

|-

| frequency

| 18,000 vph (2.5 Hz)

|-

| power reserve

| 42h

|-

| escapement

| Straight-line lever

|-

| balance

| Monometallic

|-

| shock

| KIF

|}

 

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.

 

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.”

 

 

For examples catalogued as 6612B, Monaco Legend lists Cal. 1055 on yellow-gold case 384,933, white-gold case 394,866 and platinum case 403,679. Phillips lists B1055 on platinum case 446,052; Christie's Dubai uses B1055 while listing the case as 446,062. Treat these as lot-specific catalogue labels. The Dubai case number conflicts with Phillips and Sotheby's, which both give 446,052. [https://www.monacolegendauctions.com/auction/exclusive-timepieces-38/lot-182 Monaco Legend, lot 182]; [https://www.monacolegendauctions.com/index.php/auction/exclusive-timepieces-36/lot-26 Monaco Legend, lot 26]; [https://www.monacolegendauctions.com/auction/exclusive-timepieces-38/lot-67 Monaco Legend, lot 67]; [https://www.phillips.com/detail/rolex/151223 Phillips, lot 155]; [https://onlineonly.christies.com/s/watches-online-dubai-edit/rolex-day-date-ref-6612b-extremely-rare-attractive-platinum-diamond-65/195872 Christie's Dubai, lot 65].

 

The arrival of the free-sprung Microstella balance is disputed. The usual account places it with the 66xx revision, but an auction description identifies a first-generation 6511 as free-sprung. Neither generation has quickset or hacking.

 

 

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.

 

<span id="cal-1555"></span>

=== Cal. 1555 ===

[[File:Cal 1555 movement.webp|thumb|right|220px|Cal. 1555, rotor bridge detail|alt=Cal. 1555, rotor bridge detail]]

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

! detail

! value

|-

[[File:Cal 1556 movement.webp|thumb|right|220px|Cal. 1556|alt=Cal. 1556]]

[[File:Cal 3055 movement.webp|thumb|right|220px|Cal. 3055, period parts-catalogue illustration with day-disc|alt=Cal. 3055, period parts-catalogue illustration with day-disc]]

Cal. 3055 powered refs. 18038, 18039, 18048, 18049, 18078, 18079 and early 18238 in the 1977–1988 generation. It introduced quickset for the date, while the day still advanced through the motion of the hands. The balance cock provides the usual visual distinction from Cal. 3155, which uses a full transversal bridge. Common references give a height of 6.3mm, but Rolex's parts diagram specifies 7.11mm.

[[File:Cal 3155 movement.webp|thumb|right|220px|Cal. 3155, engraved "3155," EmmyWatch|alt=Cal. 3155, engraved "3155," EmmyWatch]]

[[File:Cal 3156 movement.webp|thumb|right|220px|Cal. 3156, engraved "3156," Day-Date II official brochure image|alt=Cal. 3156, engraved "3156," Day-Date II official brochure image]]

Cal. 3156 uses Paraflex shock protection; Cal. 3155 retains KIF Elastor. Rolex filed the design in 2005, and the European patent was granted in 2008. Its spring connects to the bearing body through four arms arranged around a central support, replacing the two-arm layout common to earlier systems. Rolex claims up to 50 per cent greater shock absorption than KIF; that is a manufacturer claim, not an independent test. [https://patents.google.com/patent/US7234859B2/en Rolex patent US7234859B2]

Secondary collector references place total Oysterquartz production just under 25,000 watches, but no factory production total is cited here. The line followed the Beta 21-powered ref. 5100 of 1970, developed through the Centre Electronique Horloger consortium. The Beta 21 would not fit an Oyster case. Rolex left the consortium in 1972 and spent five years developing Cals. 5035 and 5055 in-house.

[[File:Cal 5035 movement.webp|thumb|right|220px|Cal. 5035, engraved "5035," "11 ELEVEN JEWELS," "1.55V," EmmyWatch|alt=Cal. 5035, engraved "5035," "11 ELEVEN JEWELS," "1.55V," EmmyWatch]]

[[File:Cal 5055 movement.webp|thumb|right|220px|Cal. 5055, engraved "5055," "11 ELEVEN JEWELS," EmmyWatch|alt=Cal. 5055, engraved "5055," "11 ELEVEN JEWELS," EmmyWatch]]

Catalogue descriptions treat Cal. 5055 as COSC-certified from early production. The exact certification and crystal changeover dates for Cal. 5055 and Cal. 5035 are not settled in the sources reviewed, so early Oysterquartz dial text should be checked against the individual watch.

Cal. 5055 powers the yellow-gold [[Reference:19018|ref. 19018]], white-gold [[Reference:19019|ref. 19019]] and pyramid-bezel [[Reference:19028|ref. 19028]]. Claims about cancelled successor calibers are omitted because the cited factory material does not document them.

Gruen Cal. 877 and the Bubbleback-era "9¾ ligne" description are often misidentified as Rolex calibers. Gruen's Cal. 877, used in the Techni-Quadron, is an Aegler-built architectural sibling of Cal. 300 sold under Gruen's name in the United States. It was never a Rolex commercial number. A Bubbleback-era "9¾ ligne" description records only the movement's size class, not a distinct caliber designation. The three circa-1940 Christie’s ref. 3064 catalogues reviewed for this audit use the same size-class wording and do not name a caliber; keep the 3064 movement attribution tied to those lot descriptions.