[American Waltham | Audemars Piguet | Blancpain | Breitling | Bulova | Cartier | Corum | Ellesse |Fortis]
[Girard Perregaux | Gucci | IWC | Jaeger le Coultre | Longines]
[Movado | Oris | Omega | Patek Phillipe | Rolex | Seiko | Tag Heuer]

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,here is their e mail address below

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

[American Waltham | Audemars Piguet | Blancpain | Breitling | Bulova | Cartier | Corum | Ellesse |Fortis]
[Girard Perregaux | Gucci | IWC | Jaeger le Coultre | Longines]
[Movado | Oris | Omega | Patek Phillipe | Rolex | Seiko | Tag Heuer]

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