I just got a very old vintage watch off Ebay, it's a 15 jewel hand wound Swiss Armac, art deco in style (1930s I think). I'll post pics as soon as I can, and after I've cleaned it a bit. When I wind it up though, it works fine but there comes no point when the crown goes "tight" like with my other, more modern vintage watches. So how much juice should I give it, how many turns of the crown do you reckon? And if I keep winding and winding, it will damage the movement, right? Any help is much appreciated.