Reference:Movements: Difference between revisions

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Cal. 645 belongs to the Cal. 600 family and shares the A.260 size code with Cal. 635. The distinctions are functional: Cal. 630 has sweep seconds without shock protection, Cal. 635 has small seconds with shock protection, and Cal. 645 combines sweep seconds with shock protection. Cal. 645 powered the semi-Bubbleback Oyster Perpetual refs 6084, 6085, and 6284 around 1948–1953. Hodinkee's listing for ref. 6108 case 803948 identifies Cal. 645. Heritage's 2012 lot for case 803'752 lists the movement as F 64550 ~~but does not name a~~ caliber~~; the matching digits do not establish Cal. 645~~. Auction catalogues give 17 to 20 jewels, consistent with both differing counting conventions and market-specific tariff variants found elsewhere in the family.

Cal. 645 belongs to the Cal. 600 family and shares the A.260 size code with Cal. 635. The distinctions are functional: Cal. 630 has sweep seconds without shock protection, Cal. 635 has small seconds with shock protection, and Cal. 645 combines sweep seconds with shock protection. Cal. 645 powered the semi-Bubbleback Oyster Perpetual refs 6084, 6085, and 6284 around 1948–1953. Hodinkee's listing for ref. 6108 case 803948 identifies Cal. 645. Antike Uhren Eder's 1952 listing for ref. 6108, item 7140rol, also identifies Cal. 645; it gives no case or serial number, so its identity relative to the other listed watches cannot be checked. Heritage's 2012 lot for case 803'752 lists the movement as F 64550, with no caliber designation. Auction catalogues give 17 to 20 jewels, consistent with both differing counting conventions and market-specific tariff variants found elsewhere in the family.

Catalogue labels for ref. 6085 do not agree. [https://shop.hodinkee.com/products/rolex-oyster-perpetual-reference-6085-with-waffle-dial Hodinkee Shop] and [https://amsterdamvintagewatches.com/shop/rolex-oyster-perpetual-6085/ a second dealer listing] call their examples A260; Christie’s, Phillips, Schmitt-Horan, and Dorotheum identify Cal. 645 in theirs. Since A.260 is a size-family code rather than a unique commercial caliber name, keep each label tied to its listing unless the movement itself can be checked.

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* [https://shop.hodinkee.com/collections/vintage-watches-sold/products/semi-bubble-back-ref-6108 Hodinkee Shop, ref. 6108 case 803948]

* [https://jewelry.ha.com/itm/timepieces/wristwatch/rolex-steel-bubbleback-ref-6108/a/171206-74039.s Heritage Auctions, 2012, lot 74039, ref. 6108 case 803752]

* [https://www.uhreneder.de/en/wristwatches/vintage-rolex/rolex-oyster-perpetual Antike Uhren Eder, ref. 6108 item 7140rol]

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-Cal. 645 belongs to the Cal. 600 family and shares the A.260 size code with Cal. 635. The distinctions are functional: Cal. 630 has sweep seconds without shock protection, Cal. 635 has small seconds with shock protection, and Cal. 645 combines sweep seconds with shock protection. Cal. 645 powered the semi-Bubbleback Oyster Perpetual refs 6084, 6085, and 6284 around 1948–1953. Hodinkee's listing for ref. 6108 case 803948 identifies Cal. 645. Heritage's 2012 lot for case 803'752 lists the movement as F 64550 but does not name a caliber; the matching digits do not establish Cal. 645. Auction catalogues give 17 to 20 jewels, consistent with both differing counting conventions and market-specific tariff variants found elsewhere in the family.
+Cal. 645 belongs to the Cal. 600 family and shares the A.260 size code with Cal. 635. The distinctions are functional: Cal. 630 has sweep seconds without shock protection, Cal. 635 has small seconds with shock protection, and Cal. 645 combines sweep seconds with shock protection. Cal. 645 powered the semi-Bubbleback Oyster Perpetual refs 6084, 6085, and 6284 around 1948–1953. Hodinkee's listing for ref. 6108 case 803948 identifies Cal. 645. Antike Uhren Eder's 1952 listing for ref. 6108, item 7140rol, also identifies Cal. 645; it gives no case or serial number, so its identity relative to the other listed watches cannot be checked. Heritage's 2012 lot for case 803'752 lists the movement as F 64550, with no caliber designation. Auction catalogues give 17 to 20 jewels, consistent with both differing counting conventions and market-specific tariff variants found elsewhere in the family.
 Catalogue labels for ref. 6085 do not agree. [https://shop.hodinkee.com/products/rolex-oyster-perpetual-reference-6085-with-waffle-dial Hodinkee Shop] and [https://amsterdamvintagewatches.com/shop/rolex-oyster-perpetual-6085/ a second dealer listing] call their examples A260; Christie’s, Phillips, Schmitt-Horan, and Dorotheum identify Cal. 645 in theirs. Since A.260 is a size-family code rather than a unique commercial caliber name, keep each label tied to its listing unless the movement itself can be checked.
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 * [https://shop.hodinkee.com/collections/vintage-watches-sold/products/semi-bubble-back-ref-6108 Hodinkee Shop, ref. 6108 case 803948]
 * [https://jewelry.ha.com/itm/timepieces/wristwatch/rolex-steel-bubbleback-ref-6108/a/171206-74039.s Heritage Auctions, 2012, lot 74039, ref. 6108 case 803752]
+* [https://www.uhreneder.de/en/wristwatches/vintage-rolex/rolex-oyster-perpetual Antike Uhren Eder, ref. 6108 item 7140rol]