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Although Omega is documented well enough to date their watches by serial numbers, the reference numbers can be looked up in the Omega Vintage Database. Even if you know the movement serial, with a researchable reference number you can check if the case, movement, and dial are a match.Obviously, not all of their watches are listed in there but with Omega, that’s as good as it gets.The markings consist of the purity mark, the sponsor’s/manufacturer’s mark, the assay office stamp, and a “date letter” corresponding to a particular year.Each assay office had its particular style of the “date letters”.Anyway, it’s very useful as a collector to know how to date a watch. Sometimes they’re official resources, sometimes they are compiled by brand aficionados.

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Usually for the ones that kept the records properly.High-end brands like Patek Philippe or Vacheron Constantin kept (and keep) excellent records, and the serial number tables are available alright.Some brands are documented well enough to establish a rough date of manufacture by production years of a particular model. On The Dash, which might just be the best Heuer resource out there, has entire lists of various references of particular model lines, with production years given.As long as you identify the assay office mark, dating a watch is easy, as the British hallmarks are really well documented.As you can see, there are quite a few methods for dating a watch.Some companies (as with the Gruen Watch Company), even lost rocords to fire or other natural disaster. I am sure they had no idea that their timepieces would someday be collected.