Can someone help identify this geneve watch and is it real?

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Old omega watch I just received. I am not sure if it is real or the model. Can anyone please help? Thank you. Much appreciated.

 
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The photos are poor but it looks real enough.
 
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If you do a Google image search of "Omega 166.0188" you'll find many dial variations for that reference. The Omega vintage watch website only gives one example of each reference, if even that.
 
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To be clear, though, I very well may be wrong about that reference number - I'm not an expert at all and I'm pretty unfamiliar with Geneves. To confirm, you'd have to get a watchmaker to open up the back. The reference will be on the inside of the case back.