Could you help me to identify this watch?

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Hello everybody,

I have inherited this gold watch. His serial number is : 934D733. How old is he?
Is it a real Zenith watch even if the production year is not written ?
How much is the value of this watch?
 
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With the D in the case number, it would be late 1960s. Most likely a Cal 25xxPC. The x’s represent various numbers used by Zenith to denote the movement.