Which Omega model is it?

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Hi everyone,
I just stumbled upon my great grandfather's omega model.
Does anyone happen to know what year this model could be referenced to?

Thanks in advance!
 
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Looks like one of the super thin models seen in the mid 60s to early 70s using the 712 movement. Stylish but quite small to modern tastes.
Edited:
 
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Thank you for the quick response! It is a really thin case indeed and yes rather small.

Thanks for the input!