10/12/2021 0 Comments Eterna Watches Serial Numbers
So for example the Seiko SKX007 Powered by a 7S26 Automatic Movement. Serial (Earliest)Thanks to Rolexforums member Bagel for the info and my mate Dave for bringing it to my attention :)Well it's pretty easy just so long as you know when the Movements were in production. As far as is known, longer than eight figure numbers follow this pattern, but always with the last two indicating year of manufacture.(I'll stand to be corrected in the last part of that statement if anyone knows better or more - and watches made in other Timex plants worldwide may not follow this set of rules exactly)Timex sub-brands also using some or all of this system include Kelton, Saga and various unbranded character watches.Here's the year and corresponding serial numbers for Tudor.Year. Numbers to the left of the marker indicate model of watch, those to the right of the marker are normally the movement number and year of manufacture.Assume an eight figure number, first four are 2014, this is the catalogue (model) number, and to the right, 2468 indicating a #24 movement, and year of manufacture as 1968. Mods do you think this might be worth pinning? Hopefully it'll grow into a useful resource for many.Inside the caseback is a code consisting of one letter and one number (stamped in ink - don't wash off)Don't ask about the logic, nobody seems to know :D The letter is believed to indicate either the month of manufacture, or the production line, again no one seems to know for sure.From 1967 onwards dating can be done using the numbers on the dial at the six -o'clock marker. If your movement has a R next to the number it means it's a service replacement movement (thanks to JonW for that snippet of info).Hope this helps and if anyone want to share dating information from other manufacturers please add to this post.I've got a scan of a German Tissot dating sheet somewhere, if I can find it I'll translate, type it out and post later.P.S.So the current mode of thought is like this.The 1st number of the serial number is '8' so 1968The 2nd number is 1 it is the 2nd + 3rd number which is 1+1 = 11 so the Month is NovemberThis method works well with my vintage Citizens. This was mainly because it was noted that there were apparently a lot of watch serial numbers with the 2nd number of '0/O' pointing to an October manufactured Month.
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