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The next era of vintage Rolex case back stamping is the most relevant to the project being undertaken here.In the early 1920s, Rolex introduced a new case back signature on which the number of world records set by the company in accuracy competitions was stated below the Rolex brand name.173 in the Fed Ex Cup standings, missing the Playoffs for the first time. On the PGA TOUR, claimed three top-10 finishes in 18 made cuts.

Similarly with early Rolex Oyster cases, there should be a pattern of increasing patent numbers mentioned as the years go on.Later, the mention of patents by number and individual country would be dropped but even so, Rolex gradually evolved its case back stamps and it should be possible to pick out some sort of trends.In the early 1950s, a system of date stamping was introduced for Oyster cases, with the quarter of the year in which the watch was produced indicated by a Roman numeral, after which the last two digits of the year were given in Arabic numerals.Presumably to avoid confusion among their existing customers, the new company then went through quite a long stage of having both Rolex and W & D stamped dually into its case backs.When more additions to the accompanying chart have been made, we should get a fairly definitive record of when the W & D stamp was finally laid to rest and only the Rolex name stated on its own, but provisionally, it seems likely that this phasing out began in around 1918 and was all but completed by mid-1920.

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