My recent find of a Swiss Made Rolex 17 Jewel, 'Extra Prima' 49mm pocket watch, in an English 9K A.L. Dennison Demi Humter case, has me a little confused over the movement serial number. The SN 6100550 does not make sense when referenced to the date of manufacture in the 'Complete Price Guide to Watches'.
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That SN puts the movement at around 1979-80, unlike the Birmingham Hallmarked A.L. Dennison case, which dates at 1930. Plus, there is an inscription on the dust cover with a presentation date of August 11, 1932, by 'Alice'. Can someone shed some light on this Serial Number dating mystery? I have included some photos.
If you read the 'fine print' accompanying that serial number-date list in the 'Complete Price Guide.' , note the emphasis on the word 'Approximate.' Actually, I doubt that the list even applies to Rolex standard pocket watches at all! As far as I know, the only pocket watch movements turned out by the Rolex/Aegler movement factory were an unusual, unconventional design based on the duo-dial design. They never made conventional pocket watch movements 'from scratch' themselves. Instead, they bought pocket watch movements from other Swiss manufacturers, and then probably added some of the finishing 'Rolex' touches themselves. I have no idea just how much of the finishing was done by the movement manufacturer and how much may have been added by Rolex.
For example, the 'Rolex, 42-43mm, three adjustments, cam regulator, exposed winding gears' pocket watch pictured in the two latest issues of the 'Complete Price Guide.' That I have (1997 and 2004 editions) is quite easily identified as a product of the Revue-Thommen (G. Thommen) factory in Waldenburg, Switzerland. Your watch appears to be more highly finished, and certainly more closely adjusted (temp. And six positions), and has all the earmarks of a watch movement made by the Cortebert Watch Factory, Juillard & Co., of Cortebert, Switzerland. I have seen several of the Cortebert-made Rolex movements like yours on the onternet over the years and if memory serves, one or two may have been military contract watches. The shapes of the bridges, cocks, etc., are clearly Cortebert, but may have been somewhat modified for Rolex.
Dubovik visha matematika. At least one, possibly more, even carried a Cortebert calibre number. One really distinctive feature of these Cortebert calibres, not just those made for Rolex, is the curve of the balance cock, with the regulator 'pointer' similarly curved to follow the shape of the balance cock. This feature also appeared on the Hamilton grade 669 (Cortebert cal. 536) 19-ligne movements that Hamilton used for their Traffic Special I and II watches some time after WWII. Later, the grade 669 was replaced by Hamilton grade 670 in the Traffic Specials III and IV, for which Cortebert provided an 18-1/2 ligne movement that, alas, had the more modern style of regulator that dispensed with the long pointer altogether. So even though your watch may not be a 'pure-bred' Rolex, it is still a very nice Rolex. You'll probably just have to disregard that serial number unless someone else can come up with an explanation.
However, in my opinion, for what it is worth, I think that you can rely on that August 1932 presentation engraved on the cuvette to arrive at an approximate production date. Disclaimer: I'm not a Rolex expert, nor a Rolex collector, but I can really appreciate (but never afford) the pocket watches like yours! Larry Treiman. Larry, I certainly appreciate the valuable information that you provided about the Rolex pocket watch in general, plus your knowledgeable assessment of my particular Rolex pocket watch. As a matter of fact, I took my Rolex to the local Rolex Authorized Dealer, and he gave me the same information as you have, about the Rolex Watch Co.
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