Is this genuine?

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I'd say it's a good buy if the lumes work, it looks like a fun beater watch, crown could be smaller
 
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FWIW, with a little patience, one could purchase a "decent" original, vintage Certina DS for ~300, and it would in virtually every respect be a far superior watch.
 
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Real, but as others have said, a refinished dial, and replacement, non Omega hands.