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-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-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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Rolex stamped the 1035's self-winding bridge "1030," as it also did on the 1036. This causes auction catalogues to identify the same reference under both numbers. The calendar work and 6.66mm height distinguish the 1035 from the 5.85mm no-date 1030. A correct ref. 6534 contains a 1035 regardless of its bridge engraving.

=== Cal. 1040 ===

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

! detail

! value

|-

| type

| Automatic

|-

| jewels

| 26 in examined catalogue descriptions

|-

| function

| Dead-beat centre seconds

|-

| base

| Modified Cal. 1030 architecture

|-

| documented fitment

| Oyster Perpetual Tru-Beat ref. 6556

|}

Cal. 1040 powers the Oyster Perpetual Tru-Beat [[Reference:6556|6556]]. Its centre seconds hand pauses at each marker and advances once per second. Christie’s calls it a modified Cal. 1030; watchmaker Aaron Berlow’s account of a single restoration identifies a longer second intermediate wheel for the dead-beat mechanism. His report supports the relationship between the two calibres, but does not establish that every 1030 part is interchangeable.

Christie’s, Phillips and Antiquorum catalogue 26 jewels on the examined examples. Phillips also catalogues one watch as ref. 6558 with an inner caseback stamped 6556 and Cal. 1040; that lot does not establish general 6558 fitment. The available records do not establish a changeover sequence, beat rate, power reserve, or full production interval for the 1040. Auction essays place the 6556 introduction in 1954 and often give 1959 as its end; later-dated 6556 lots make the cutoff uncertain. Those dates describe the watch reference and should not be treated as a verified movement production range.

Hodinkee’s 2016 review says the dead-beat function was often removed during service, though the photographed example still worked. Watchmaker Aaron Berlow wrote in 2015 that reports of Rolex replacing the 1040 module with 1030 parts were internet hearsay he had not seen first-hand. These accounts do not establish a service frequency or document a specific replaced movement.

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.

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== Sources ==

* [https://www.christies.com/lot/rolex-a-rare-stainless-steel-automatic-wristwatch-6139178/?intObjectID=6139178&lid=1 Christie’s, ref. 6556, case 138'822, Cal. 1040]

* [https://www.hodinkee.com/articles/the-restoration-of-a-rolex-tru-beat-caliber-1040-reference-6556 Aaron Berlow, Cal. 1040 restoration, Hodinkee, 2015]

* [https://www.hodinkee.com/articles/bring-a-loupe-april-8-2016 Hodinkee, ref. 6556 dial and service observations, 2016]

* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-260-217 Antiquorum, ref. 6556 and proposed ref. 1020, 2012]

* [https://uhren-muser.de/archives/100/50452 Dr. Crott, ref. 6556 and proposed ref. 1020, 2019]

* [https://www.phillips.com/detail/rolex/101269 Phillips, ref. 6556, 18K gold, Cal. 1040]

* [https://www.phillips.com/detail/rolex/139759 Phillips, ref. 6556, Cal. 1040 and steel case]

* [https://catalog.antiquorum.swiss/en/lots/rolex-ref-6556-0-oyster-perpetual-tru-beat-lot-327-215 Antiquorum, ref. 6556/0, Cal. 1040, 2020]

* [https://catalog.antiquorum.swiss/en/lots/rolex-ref-6556-tru-beat-lot-345-357 Antiquorum, ref. 6556, Cal. 1040, 2021]

* [https://www.vintagewatchstraps.com/blogoysterwatchco.php David Boettcher, “Oyster Watch Co.”; FHF 30 and Tudor Cal. 59/59SC]

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* [https://www.emmywatch.com/wp-content/plugins/watchsearch/inc/documents/rolex--1565--movement_parts.pdf Rolex Cal. 1565 parts catalogue, Rolex technical department]

* [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Rolex Cal. 1575 parts catalogue, Rolex technical department]

* [https://www.phillips.com/detail/rolex/HK080319/903 Phillips, HK Auction NINE lot 903, exterior ref. 6558 / inner stamp 6556, Cal. 1040]

@@ 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-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-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 1,188: / Line 1,188: @@
 Rolex stamped the 1035's self-winding bridge "1030," as it also did on the 1036. This causes auction catalogues to identify the same reference under both numbers. The calendar work and 6.66mm height distinguish the 1035 from the 5.85mm no-date 1030. A correct ref. 6534 contains a 1035 regardless of its bridge engraving.
+<span id="cal-1040"></span>
+=== Cal. 1040 ===
+{| class="wikitable" style="width:280px; font-size:90%;"
+! detail
+! value
+|-
+| type
+| Automatic
+|-
+| jewels
+| 26 in examined catalogue descriptions
+|-
+| function
+| Dead-beat centre seconds
+|-
+| base
+| Modified Cal. 1030 architecture
+|-
+| documented fitment
+| Oyster Perpetual Tru-Beat ref. 6556
+|}
+Cal. 1040 powers the Oyster Perpetual Tru-Beat [[Reference:6556|6556]]. Its centre seconds hand pauses at each marker and advances once per second. Christie’s calls it a modified Cal. 1030; watchmaker Aaron Berlow’s account of a single restoration identifies a longer second intermediate wheel for the dead-beat mechanism. His report supports the relationship between the two calibres, but does not establish that every 1030 part is interchangeable.
+Christie’s, Phillips and Antiquorum catalogue 26 jewels on the examined examples. Phillips also catalogues one watch as ref. 6558 with an inner caseback stamped 6556 and Cal. 1040; that lot does not establish general 6558 fitment. The available records do not establish a changeover sequence, beat rate, power reserve, or full production interval for the 1040. Auction essays place the 6556 introduction in 1954 and often give 1959 as its end; later-dated 6556 lots make the cutoff uncertain. Those dates describe the watch reference and should not be treated as a verified movement production range.
+Hodinkee’s 2016 review says the dead-beat function was often removed during service, though the photographed example still worked. Watchmaker Aaron Berlow wrote in 2015 that reports of Rolex replacing the 1040 module with 1030 parts were internet hearsay he had not seen first-hand. These accounts do not establish a service frequency or document a specific replaced movement.
+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-1530"></span>
@@ Line 2,961: / Line 2,991: @@
 == Sources ==
+* [https://www.christies.com/lot/rolex-a-rare-stainless-steel-automatic-wristwatch-6139178/?intObjectID=6139178&lid=1 Christie’s, ref. 6556, case 138'822, Cal. 1040]
+* [https://www.hodinkee.com/articles/the-restoration-of-a-rolex-tru-beat-caliber-1040-reference-6556 Aaron Berlow, Cal. 1040 restoration, Hodinkee, 2015]
+* [https://www.hodinkee.com/articles/bring-a-loupe-april-8-2016 Hodinkee, ref. 6556 dial and service observations, 2016]
+* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-260-217 Antiquorum, ref. 6556 and proposed ref. 1020, 2012]
+* [https://uhren-muser.de/archives/100/50452 Dr. Crott, ref. 6556 and proposed ref. 1020, 2019]
+* [https://www.phillips.com/detail/rolex/101269 Phillips, ref. 6556, 18K gold, Cal. 1040]
+* [https://www.phillips.com/detail/rolex/139759 Phillips, ref. 6556, Cal. 1040 and steel case]
+* [https://catalog.antiquorum.swiss/en/lots/rolex-ref-6556-0-oyster-perpetual-tru-beat-lot-327-215 Antiquorum, ref. 6556/0, Cal. 1040, 2020]
+* [https://catalog.antiquorum.swiss/en/lots/rolex-ref-6556-tru-beat-lot-345-357 Antiquorum, ref. 6556, Cal. 1040, 2021]
 * [https://www.vintagewatchstraps.com/blogoysterwatchco.php David Boettcher, “Oyster Watch Co.”; FHF 30 and Tudor Cal. 59/59SC]
@@ Line 3,111: / Line 3,150: @@
 * [https://www.emmywatch.com/wp-content/plugins/watchsearch/inc/documents/rolex--1565--movement_parts.pdf Rolex Cal. 1565 parts catalogue, Rolex technical department]
 * [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Rolex Cal. 1575 parts catalogue, Rolex technical department]
+* [https://www.phillips.com/detail/rolex/HK080319/903 Phillips, HK Auction NINE lot 903, exterior ref. 6558 / inner stamp 6556, Cal. 1040]