Grandfathers Omega Watch details/value

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Hi
Inherited this watch from my Grandfather over 30 years ago. Its been in storage since and I don't wear watches so interested in the value/sale.
I wound it up yesterday and it is running fine - but maybe gained 3 minutes over the 36 hours.

For what is worth I am based in New Zealand

Omega
Waterproof modele+depose
Military perhaps
Edited:
 
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I do not have the expertise to comment on it in terms of item specifics. In so far as value goes it would be worth a lot to me having been my grandfathers. Good luck.
 
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Early model Omega, worth approximately $300 if you were to sell it.

inside caseback has all the details.
Age can be told by which movement, serial # and also model # is on the inside caseback