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It is not easy to give you advice using just that photo.
I have seen these also being made in 60's (but I am not sure of the reference number)
Are there any numbers engraved on the back? Your best bet would be to take the watch
to a skilled watchmaker who can open the case-back. All information (reference as well
as the caliber and serial number) will be visible than.

Having THAT information, you can contact PP in Geneva and for 100 CHF they can issue
the Certificate of Origin. This will list the model, serial number as well as when the watch
was made and sold.

Best of luck !
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