Felsa 692 hairspring stud

[lew07]

Hi Guys.Please May I ask your opinions? I managed to lose the hairspring stud on a Felsa 692. It’s a Mudu Doublamatic . What should I do please?

[Nucejoe]

 Shouldn't be hard to find a used replacement, plenty of damaged balance completes were replace with NOS, leaving behind damaged ones for parts. 

Stud off of some other calibers might also fit. Check julesborel.com. 

Good luck 

[Nucejoe]

 Just checked julesborel's site, lists no hairspring stud for felsa 692. so lets go to Dr ranfft site which lists all variants of the family/ generation felsa 692 is a member of. 

If you have not visited Dr ranfft's site before. I enter the key words like 

felsa 692 ranfft 

Stud interchanges between all member of a family, this will broden you choices as you hunt. 

Good luck

[lew07]

Thanks very informative. It looks like it shares parts with the 690. The main difference being mine has a date wheel. 

[Nucejoe]

1 hour ago, lew07 said:

Thanks very informative. It looks like it shares parts with the 690. The main difference being mine has a date 

Right,

The  date indicator is called a complication, so are calender or power reserve called complications. but parts to each complication are different and some are specific to that complication.

 The part relevent to time keeping are exactly the same in all variant of a family, in other words any part of the base caliber interchanges with that of any other variant in the family.

Furthuremore, there might be several families in a generation. A new family may beat faster or hold more wind or selfwind....so on.

Regards