Sometimes, resources aren’t available or they don’t answer your questions. Omega placed the year of manufacture of a particular batch of cases immediately after the reference number in Speedmasters.įor Doxa, the first two digits of the case serial number mark the year (only for watches made between 19). Rolex sometimes has put the quarter or the month in Roman numerals, and the year in Arabic numerals on the case back. Bulova used a letter to mark the decade, a number from 0 to 9 to mark the year in the decade. Some brands, like Bulova, used simple means of marking the date of manufacture. Obviously, not all of their watches are listed in there but unfortunately, that’s as good as it gets. You can check if the case, movement, and dial are a match if you have a reference number.
But you can also look up the reference numbers in the Omega Vintage Database.
Omega kept archives that are accurate enough to date their watches by serial numbers. OnTheDash has entire lists of various models, with production years given. That’s because production years of a specific model are known. The documentation of some brands is good enough to come up with a rough date of manufacture. In case of many serial number resources for a brand, check the serial with all of them. So, always make sure that you’re matching the serial number with the right resource. Before that, they had a separate system for watches made at their French factory in Besancon. Zenith changed their serial number system circa 1962. Omega serial numbers are different for Speedmasters. For example, Doxa used separate serial number systems for solid gold cases. Keep in mind, that it’s important to research the system of production markings specific to a brand. Different serial number systems within one brand So, their serial numbers are also available. High-end brands like Patek Philippe or Vacheron Constantin kept (and still keep) excellent records. If there are official resources, they usually make their way into the Internet and aren’t hard to look up. That would be Omega, Longines, Rolex, Zenith, etc.
Usually for the ones that kept accurate records. Serial number charts are only available for a handful of manufacturers though. Sometimes they’re compiled by brand aficionados, who attempt to combine all the bits of knowledge into one resource. The first thing to check are serial number charts.
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