well I bought a joblot of watches and this was in it.
was told at the time that you could set the time but winding it up does not work .. so I thought nice dial and if I could not fix it I would swap the dial out to something else so guess my surprise when opening it I saw this well I found a 371 battery to fit and is working like a charm but just curios to find out more .. so any theory out there guy's/girls