If it is vintage it could be a manual wind movement.
Give the crown a good wind until it stops and u cannot wind anymore. What may of happened is when you altered the time on the watch, you gave it a short wind giving it some power and after a short while of course it stopped.
You may need to wind it up every couple of days to get power in the movement. Give it a try a nd see if that works before spending money servicing
Regards
Terry
www.watches.co.uk