Identifying production year with clasp code

[FlyinM3]

I have never tried to determine the production year of a piece I own until now. I'm trying to determine it without removing the bracelet to check the case serial number, but through the clasp code. I know this method may not be as accurate since it tells the production date of the clasp itself, but all I need is a ballpark date. The code reads "S6", therefore is it safe to assume this falls somewhere in the 1994 timeframe?

I'm having problems trying to upload a pic, but it's a 16628 YM YG with outer lugholes for the pushpins.