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All Seiko's should have a Serial number on the case back The first number in the Serial is the last number in the year of production, and so if it is a new watch and you see an 8 it should be the year 2008 The second number in the Serial is the month the watch was made if you see a 4 it will be the month of April most Seiko serial are 6 digits long and so a serial of 86XXXX would be a watch made in April of 2008 The key to the whole trick is knowing what movement is in side and older movement like the 6309 was made in the late 70's and 80's and so a watch with 86XXXX would be April 1988 and so on ...

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" We hear that a lot here at Watch Sleuth so we built this page to help you figure it out. If you don't know how to find these numbers on your watch please read our instructions below. We encourage people to send us additions and corrections.

All Seiko's should have a Serial number on the case back The first number in the Serial is the last number in the year of production, and so if it is a new watch and you see an 8 it should be the year 2008 The second number in the Serial is the month the watch was made if you see a 4 it will be the month of April most Seiko serial are 6 digits long and so a serial of 86XXXX would be a watch made in April of 2008 The key to the whole trick is knowing what movement is in side and older movement like the 6309 was made in the late 70's and 80's and so a watch with 86XXXX would be April 1988 and so on ... Someone (on the net) offers Seiko SKX781K or "orange monster" with following description: * 7S26-0350 (so it would be: movement 7S26 & case no. Then using the calculator, found production date is August, 1996?

A note on months since only one numberis used for the months Oct / Nov / Dec being two numbers is noted by letter if you see a Zero it is a letter O for October N= Nov D= Dec 8DXXXX would be December 2008 8OXXXX would be October 2008 It does help to know a little about movement production dates when dating watches on the street but if you have a computer handy you can always drop by these fine websites: Seiko Watch Production Date Calculator production date finder ... There is still a need to know when the movement came out or a rough estimate.

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.

The page includes a calculator along with instructions and example images to help you find the movement caliber, case code and serial number on the back of your watch. Most Seikos have a "retail" model number that is displayed in the store but not written anywhere on the watch.

They also have a "reference" model number that is written on the case back.

General rule for manufacture month/year is to look at 1st digit of serial # to say what year within decade. For month, 1-9 are Jan thru Sep, with 'O' for Oct, 'N' for Nov, and 'D' for Dec.

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