I have a Valjoux 7731 movement that could use a crown wheel, and possibly ratchet wheel and winding pinion as well.

Out of my tech depth here and would appreciate some help, so a question for those in the know...

Are these specific parts perhaps interchangeable with other movements from the 773x family, or from the pre-Valjoux predecessor Venus 188?

 

Only the 7730.

I had a look at the Valjoux interchange chart and could see the ability to share partson the 7733 onwards so I checked Ranfft and he says that the 7731 is a 7730 with a different balance and that the 7733 was a complete re-design.

 

I've now got three different answers on whether 7730 parts will fit.

The 7730 parts are plentiful and cheap so I suppose I'll give it a go.

 

Depends on how big of a hammer you're using.

 

This one should do the job.

 

Thanks again, worked like a charm!