Help identifying this Omega

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Can I get some help identifying this watch? It’s been passed down through my friend’s family for the last three generation. It was most likely bought in Greece.
 
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Late 70’s gold plated Geneve.
The model number is on the inside of the inner caseback.
Should clean up well. He didn’t win the lottery though.
 
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I think maybe ref. 166.0118.
1970's, as said, and most likely with calibre 1481 movement inside.
 
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Unfortunately (and not sure why), his father at some point had the back replaced with a plain back that doesn’t have any model number info. Any best guesses at this info would help.