I think we all learn from mistakes like these. Luckily, you haven't paid a penny so it's no big deal. Someone was trying to rip you off let's face it. Just cancel the transaction on eBay. The seller won't be bothered as I'm sure they'll expect things like this. There's no way they would list an Omega for 150USD and not know it's fake. No way.
The only Omegas for that sort of money are either very old models or that one in a million that wasn't too good to be true.
However, as suggested, research these things more. You could have spent 1000USD here thinking that everything seemed right only to receive a fake still. Knowledge is the only way you'll (hopefully) avoid issues.
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