Check the quick set date function

If equipped. Some of these older models use a push or pull of the stem to quick set the date, and often these get damaged and need new parts.

Here is a video I took of one that I repaired a while back. It shows the assembled watch and how the quick set is used by pushing the crown in.

http://www.youtube.com/watch?v=XZP9RDX2DaY

Note that many of these old Tissot's have basically Omega movements in them. The Cal. 2591 aboive is basically the same as the Omega Cal. 1480.

As always, I advise people to factor in the cost of servicing any vintage watch they buy to avoid disappointment. If you don't have to service it, consider it a bonus.

Hope this helps.

Cheers, Al