Omega watch 1976

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Hi, could anyone help me confirm if this Omega watch is real? It was my grandmother’s.
This is the description: omega 21 rubis antimagnetic 18k 0.750 137 1976

 
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You'll need to post better photos for a definitive answer but I think I see enough to be confident it is both a fake Omega and likely not real gold either. The reasons for this are twofold. Firstly you pretty much never see marks like that on outside of an Omega caseback, the marks are on the inside and secondly '21 Rubis' text is another red flag. You never see that on genuine Omega products.