but also remove the stem to see the movement. If you just pop the caseback the only thing that happens is that the front part of the case comes off as the dial and movement is attached to the caseback by the stem.
I have always had my winders set in around 650 tpd and it works fine for all my watches. It seems like when I increase tpd for the 3940 to around 1000 tpd it works fine (and also when worn) but not on lower settings. Probably time for service soon but isn’t it a bit strange that the only problem is
I have it and A91 is 24x18 mm, tang buckle, flat (non padded) 2.5 mm, shiny alligator with square scales in color 100 which is black. It is for eg ref 5076 in platinum. I could not find the alpha code C34, are you sure it is correct?