Date a Seiko by serial number How to decode the serial number on a Seiko watch The easiest way to find the date of a Seiko serial number is to use the automated Seiko serial number decoder but this page explains how to do it manually. Seiko watches use a 6 or 7 digit serial number stamped on the caseback. This serial number contains digits indicating the date. The first digit translates to the year and the second shows the month. As only 1 digit is used for the year this will only show you the last digit of the year, the decade cannot be found from the serial number, more on this later. For the second digit covers up to September.
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Deep Dive: The Evolution of the Seiko Turtle
Deep Dive: The Evolution of the Seiko Turtle - Worn & Wound
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. The calculator uses these codes to do its magic. If you don't know how to find these numbers on your watch please read our instructions below. You can also view the entire datefinder database.
As with many of the vintage Seiko models, the last digit of the reference number denotes the original market that the watch was intended for. The was designated for the North American market, and the was for the Japanese Domestic market and the rest of the world. It should be noted that from to Seiko produced the , a cousin to the The was made exclusively for the Japanese domestic market. The Seiko comes housed in a large cushion shaped stainless steel case that measures 45mm wide by 48mm long and 13mm thick, with nice 22mm lugs.
The crown pulled out to the first position sets the day in one direction, and the date in the other. The luminous compound has attacked the metal of the hands, and they are corroded. The bottom plate is fairly complex in its layout, but, as a reward for this complex construction, the date and day change and the quick-set function work extremely well. Watch and learn, Tissot and Omega of the same era!