Real or Fake Omega Watch Cases? Authenticity Help

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Hello everyone,

I just saw these cases for sale.

I noticed that two of them have no engraving on the inside. Can I assume that they are not genuine?
They are supposed to come from a watchmaker's liquidation.

Thank you very much.

 
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I would assume that they are fake unless proven otherwise by someone with far more knowledge than I.

gatorcpa
 
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Depends on where they're for sale or where they originated from.

My suspicion is that they "walked" out of one of the case makers factories who produced cases for Omega.
 
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My suspicion is that they "walked" out of one of the case makers factories who produced cases for Omega.
They don’t look fake to me so perhaps this?