You can try it and report back, but I didn't think they were interchangeable.
Thank you for the advices!
I understood that swapping rotor and using a slimmer case back it was possible to have a watch with good power reserve and gen-like thickness.
At this point I leave it as is...
Since you have several 7750 I have another question: it is normal that the watch is very very precise (less then 1 second per day), but when I set the hour after some day I don't use it, even if manually winded, for the first minute, the minute's hand does not run, then goes perfectly?
Thank you
this is because the 7750 has an offset canon pinion , it is not direct drive with the rest of the gear train so the additional gears create some backlash , resulting in what you are noticing , setting the time foreward past the correct time , then backwards to the correct time should reduce this "lag"Since you have several 7750 I have another question: it is normal that the watch is very very precise (less then 1 second per day), but when I set the hour after some day I don't use it, even if manually winded, for the first minute, the minute's hand does not run, then goes perfectly?
Which back case will work without maching?
this is because the 7750 has an offset canon pinion , it is not direct drive with the rest of the gear train so the additional gears create some backlash , resulting in what you are noticing , setting the time foreward past the correct time , then backwards to the correct time should reduce this "lag"
I have this on some of my Asian clone 7750. I've found that if you turn the crown to back the hand up a couple of minutes it'll not stay dormant for the first minute after setting. Takes a little bit to get used to, but after a few tries you'll get it to cooperate. Not sure exactly why this occurs, but I've experienced it on more then one. not recommended, but you can always remove the rotor and it will run silent. You have essentially created a manual winding watch then, but an option I seen a couple of members elect. I personally wouldn't do it as you are putting unnecessary wear on the movement and crown.