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. Previous to this Seiko used a seven digit serial number with a similar format. Most Seiko serial are 6 digits long and so a serial of 86XXXX would be a watch made in April of 2008 The six digit serial numbers are found on Seiko models beginning from 1966. 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 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 month and last digit of the Seikoa date of. The second character can be a letter but the rest are all numbers.You can use the Seiko serial number in conjunction with the movement number to calculate the year of manufacture. You can sort the designs of Seiko watches and narrow them further using the movement number and the various serial. All Seiko's should have a Serial number on the case back Find the manufacture date of any Seiko watch.Seiko watches have a 6 or 7 character serial number on their casebacks. The first four digits represent the movement.
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