Help identifying a vintage gold De Ville

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Can anybody help identify the reference for the below Omega De Ville?
I have trawled through the Omega website and Google but can’t find anything on this exact dial and bracelet combination.
It was my grandfather’s watch and we have the original invoice from 1979 from a local dealer but it does not provide much information on the model apart from it being 9ct gold.
The movement is hand-wound. Still fully functional. We haven’t taken the caseback off.

Any help would be much appreciated!
 
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Thanks for the reply. 311.0165 seems to be a stainless steel watch though?
Older references don't refer to a single finish/dial/etc like they do today, but I am unsure when that change happened. @JimInOz claims here

That they were made in steel, white gold, and yellow gold (but doesn't know if they were available plated).

Actually, looking at that listing, that was YOUR thread from back then, so the same picture 😀 I guess that explains why it looks alike!

You'll have to pull the case back to be sure.
 
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Actually, looking at that listing, that was YOUR thread from back then, so the same picture 😀 I guess that explains why it looks alike!

You'll have to pull the case back to be sure.
Well that’s embarrassing… totally forgot I had posted that 😂 apologies for the double-post!
 
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Well that’s embarrassing… totally forgot I had posted that 😂 apologies for the double-post!
The rare 4-year-long double-click 😁
 
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If it’s in 9k and from the 70s, there’s a good chance it’ll have Shackman of London markings inside. And possibly a case number of the form xxx.5yyy

It is just possible that it didn’t have a direct Swiss analogue. Shackman and Dennison before them sometimes did their own thing.