I can't be certain, but I have a bad vibe about it. The dial should indeed have the wave pattern, and the engraving on the interior of the clasp looks sloppy. If I had to guess, I'd say it's a fake - I would bet that if you remove the back you won't find an Omega calibre 2500 inside.
And for the price, you could have gotten a genuine one at an Omega Boutique.
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