The bracelet isn't right - doesn't even appear to fit correctly. Omega has the 1287/250 listed for this case.
Not unusual that the case back had more than one case number stamped inside, so that I wouldn't worry about personally. But these aren't really rare or highly valued watches, so if you don't feel 100$, walk away. note that I would count on a full service as well, unless the seller can provide proof (not just their word) that it was recently serviced by a known good service provider.
Cheers, Al
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