Identifying this old 18k gold omega

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Inherited this vintage watch but I’m not sure what kind or year it is. Seeing a few models online similar but not exactly like this one. Any helped would be appreciated.
On the back is says:
Swiss Made
18k 0.750
161
1196
25139

Front only says Omega
Thanks for your help.
 
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Style roughly ca 1950s.

Case does nor appear to be an "Omega" case which typically has the markings on the inside of the back, so there may be no actual reference number to search by. Can we get photos of the inside of the case back and movement, these would help a lot.
 
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General rule is that nomenclature on the outside equals fake but as Norman says above, it appears that this may be an import case.

Where are you located and would you have access to the inside caseback and movement as Norman asked?

What is the sentimental value to you?

I also suspect an old redial based on marker alignment and inconsistency in the subdial but this could just be a sign of the times.