Serial number information for New York Standard is incomplete and inconclusive. This table is NOT correct This is the only published table of NYS Serial Numbers and Production Dates we have found, but we know these numbers to be wildly inaccurate. I should have made the point that '20L corresponds the the open face caliber and the 'L' most probably is specific to that style. New York Standard Serial Numbers and Production Dates. Have you obtained a certificate from Longines and pointed out the discrepancy? Having read your post more carefully - I apologise for failing to do initially - the scenario you describe is certainly very plausible. When the watch was subsequently serviced the same serial number was stamped on the movement. Our best watches often sell before they ever reach the website. It was a serial number stamped in the same manner on the watch I illustrated, that Longines used to identify the watch and issue their certificate of authenticity. The serial number is found on the inside of the 'Longines engraved dome' and the movement caliber, and age, are all consistent with the number. For this particular watch I believe it is very safe to make the inference. While I agree that you definitely cannot draw the general inference that a case serial number will correspond to the movement serial number and it is wise to make that point.
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