It is a ...

 

Hi Brian,

the pictures tell it all:  model "Centenaire"  Chronometre from 1948, Ref. 2500

This ref# is not always found in the case back but it is ref 2500 without any doubt!

Does it have the additional "JUB"  behind the 30.10 RA (found below the balance)? Or can you find "333" somewhere on the movement?

I guess it is the more common  Cal. 30.10 RA  JUB...

BTW  nice watch and a good catch!

kind regards

Erich


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