I'm looking at a coupla vintage Tissot Seastars, and hoping that someone can help me match the serial number on the movement to the production year. The watches are from the 1970, give or take a couple of years, and I'm quite sure that they are genuine. I'm not asking for someone to authenticate them, rather help me determine the production year. Is there a website or database I can use? I don't mind doing the scut work, but I don't know where to search. Please point me in the right direction.
Thanks in advance.
ps: this has already been cross posted in the Tissot, Vintage and Public Forums.