Need to ID details of seamaster De Ville without opening it

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I have a Omega Seamaster De Ville that I would like more details about without opening it to get the serial number.
Can you help identify the watch model/product code, movement, etc..
Is there anything unique about this watch.
I posted it on eBay and immediately got 5 offers. They seem to be coming from Vietnam.
I am concerned about not knowing the serial number and getting SCAMMED.
The buyer may switch my watch with a non-working unit and then trying to return it. SCAM.

This is what I know about the watch...
It belonged to a relative and was purchased new, I think in the 1960s
14K bezel and SS back stamped on watch
Automatic wind
34mm excluding crown,
Lugs are gold and 18mm between them
Dial is silver
Omega markings on dial, stem, back
Dial marking are Omega logo, Omega, De Ville Seamaster, Automatic, Swiss Made
Photos included
Thanks
 
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Can you help identify the watch model/product code, movement, etc..
It's complete guess work without seeing inside for movement no. and case ref.
If pushed I would say model no.166.020 with 562 movement. The movement CAL could be 562, 563 or 565 depending on year of manufacture.
If the date changes when you pull the crown out fully, two stages, it's either a 563 or 565. If the date doesn't change and only pulls out one stage it's a 562.
Edited:
 
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It's complete guess work without seeing inside for movement no. and case ref.
If pushed I would say model no.166.020 with 562 movement. The movement CAL could be 562, 563 or 565 depending on year of manufacture.
If the date changes when you pull the crown out fully, two stages, it's either a 563 or 565. If the date doesn't change and only pulls out one stage it's a 562.
Tks for the info