Yeah, the first 2 digits of the serial no tell you the year and month. IIRC, the 13 came out late 1990s so if the first digit is >=6 then it could be 96 otherwise a low number would likely be 200x. The 2nd digit is the month (1=Jan, 9=Sept, 0=Oct, N=Nov and D=Dec).
Do you have an idea of how old the watch is?
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