Does the crystal have the Omega logo in the center? That's a good way to quickly check whether it's authentic or not (though there could be aftermarket crystals that have it etched as well). Of course, that doesn't necessarily mean it's the correct crystal. If the watch arrived to you with the scratch / crack (can't tell, but it's a big one either way) then it should be replaced free of charge.
Either way, send it back - if you spent $850 on a service and got back a watch with problems, it should be made right by the watchmaker I think.
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