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Seikos have the date of manufacture written into the serial number which
is engraved on the back of the watch also the movement-model numbers are also
engraved onto the case back. The first number represents the year and the second
number (or letter) represents the month (1-9 for Jan.-Sept. and O,N and D for
October, November and December).For example if the serial number was 864825 and
you knew the watch was made sometime in the 1970's it would indicate it to be
made in June 1978. You have to know the age of the watch to the nearest decade
so sometimes it can be a little bit difficult. Usually the case style or the
introduction dates of the movement can help to narrow this down
though.
General rule for manufacture month/year is to look at 1st digit of serial
# to say what year within decade. Then look at 2nd digit/letter to tell month.
For month, 1-9 are Jan thru Sep, with 'O' for Oct, 'N' for Nov, and 'D' for
Dec.
For decade itself, you have to know the actual production dates of the
movement itself. If you don't you could e-mail Seiko customer service
in (Japan), quoting model and serial numbers and they should be able to
help, there e-mail address is yserv@seiko-watch.co.jp
This is also worth a try THE SEIKO WATCH PRODUCTION DATE CALCULATOR if you are not sure what decade your
Seiko was made in , it works for some but
not others but a nifty little application
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