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Girard Perregaux

Very nice! :)

 

Yes, GP changed from having the refrence number between the lugs to the case back sometimes in the 1970s.
From the ref number I guess your Watch is from the mid/late 1970s.
Will check if I can find out anything about your watch.
But fear that anything from the manufacture will be after Basel.
So please have patience.
Best
Blomman

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