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One more vintage GP to the collection.

 

My second vintage GP arrived a week ago, I haven't taken it off much since, I am not too familiar with this model however the information I have found says it is a type 20. The movement is a Valjoux 720 with flyback function dating from around the 1960s.
I am very happy with the deep diver now too, I have fixed the movement and have found a more appropriate tropic strap for it.
Does anyone have more information on the type 20 please? Is it in fact know as the type 20?
Thanks Michael.







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