Reference:Movements: Difference between revisions

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The Field Manual also lists Cal. 630 against the 3372 suffix variants. Antiquorum explicitly names Cal. 630 in a 3372 with centre seconds ([New York lot 436](https://catalog.antiquorum.swiss/en/lots/rolex-lot-23-436)). The same manual lists subsidiary seconds for one 3372/3 entry, while Christie's catalogue describes a 3372 with small seconds and a 9¾-ligne, 17-jewel movement but gives no caliber number ([case 474309](https://www.christies.com/lot/rolex-oyster-perpetual-chronometre-bubble-back-ref-5091692/?intObjectID=5091692&lid=1)). Keep those statements tied to their sources; they do not establish a Cal. 630 small-seconds variant.

Henrik Korpela identifies Cal. 630 NA in one gold watch catalogued as ref. [[Reference:6074|6074]]; its movement number is 56567. Korpela's photographs show 6030 and 6031 scratched out on the caseback before 6074 was stamped over them ([https://watchesbysjx.com/2015/05/explained-restoring-a-1950s-rolex-oyster-perpetual-ref-6074.html SJX restoration]). Antiquorum's 1992 platinum 6074 lot gives a 9¾-ligne, 17-jewel movement with antishock but names no caliber ([https://catalog.antiquorum.swiss/en/lots/rolex-lot-146-67 lot 67]). Keep each description attached to its watch; the records do not establish a reference-wide caliber assignment.

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 The Field Manual also lists Cal. 630 against the 3372 suffix variants. Antiquorum explicitly names Cal. 630 in a 3372 with centre seconds ([New York lot 436](https://catalog.antiquorum.swiss/en/lots/rolex-lot-23-436)). The same manual lists subsidiary seconds for one 3372/3 entry, while Christie's catalogue describes a 3372 with small seconds and a 9¾-ligne, 17-jewel movement but gives no caliber number ([case 474309](https://www.christies.com/lot/rolex-oyster-perpetual-chronometre-bubble-back-ref-5091692/?intObjectID=5091692&lid=1)). Keep those statements tied to their sources; they do not establish a Cal. 630 small-seconds variant.
+Henrik Korpela identifies Cal. 630 NA in one gold watch catalogued as ref. [[Reference:6074|6074]]; its movement number is 56567. Korpela's photographs show 6030 and 6031 scratched out on the caseback before 6074 was stamped over them ([https://watchesbysjx.com/2015/05/explained-restoring-a-1950s-rolex-oyster-perpetual-ref-6074.html SJX restoration]). Antiquorum's 1992 platinum 6074 lot gives a 9¾-ligne, 17-jewel movement with antishock but names no caliber ([https://catalog.antiquorum.swiss/en/lots/rolex-lot-146-67 lot 67]). Keep each description attached to its watch; the records do not establish a reference-wide caliber assignment.
 <span id="cal-635"></span>