From what I understand this was first mentioned with the forum favourite 'BB58'

 

Very surprising to hear as this is a COSC watch, how could they get away with the serial# not matching the case#. What happens if the owner would happen to have the original COSC certificate and after service there's another movement in his watch?

 

Yes, I confirm also this info about Tudor

I know some people at Tudor in France and the HQ.

 

I cant remember seeing no cosc certificate included with my fiddy eight?

 

I meant in the case someone had mailed Tudor and paid for it to get his set complete, Omega for example charges 100 chf if you want to go that route.

 

Ahaa I didn't know this was an option! Thanks bruh

 

I have read they do hot swaps with the modular Dubois Dépraz chronographs. I do not know if that includes the entire movement for the simply the chronograph module. I assumed the movement are serialized but I don't know for certain.