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?
Saying you want a non-smoker with a good sense of humour is fine, but mentioning that you’d also like them to love animals, look like a catwalk model, earn millions and be passionate about sci-fi is a little too far.
Remove the case back (of either type) from the watch.
Use a jeweler's loupe to inspect the movement for a serial number.
Watches like Elgin, Waltham and Omega kept excellent records, allowing for good dating of their watches.
Watchmakers like Gruen, however, destroyed their records, making exact dating impossible.
The truth is, accepting who you are, just the way you are, will help more than anything when it comes to finding your ideal match.