Rolex Bubble Back crowns post Patent (- BOX stamped 24-7) 1950s Yellow Gold and steel
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Jun 25, 2021 - Jul 3, 2021
|Reference number||2940 & 3131 Rolex Bubble Back 24-7|
|Year of production||1950|
|Condition||Unworn (Mint condition, without signs of wear)|
|Location||Canada, Victoria British Columbia|
Rolex bubbleback crowns circa 1950 onwards, these are easily distinguishable from the 1940s Bubble back crowns, as they have a BOX and a - (Minus) sign to show they were twinlock crowns. These crowns are for Bubble back models 3131 & 2940 and more, before these, they made them for a brief moment without the BOX'd Minus sign, after these were Patented - they delivered them with a small box stamped in the middle, and the minus sign. I would imagine, tube structure changes also followed, hence there are two sizes.
I would imagine these crowns are for the smaller sized (33 mm versions, as they're all marked 8 3/4" ligne calibers) but, for all intents and purposes, they will cross fit a variety of Bubble backs.
Dimensions are: 5,38 mm or 5,40 mm diameter of the crown/ 1,65 mm is the diameter of the tube.
Additionally, I have some generic bubbleback tubes if they're needed to go with the crown/ This is as a request only (For tubes)
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