The strap is probably an OEM Omega strap given how well it fits at the lugs and it is on an Omega deployant clasp. The watch looks legit.
What you want to do is make sure that the Watch No. on the warranty card (blacked out in the photos) matches the laser engraved serial number etched into the back of the lug near "7" on the dial. If that matches, you'll be good to go.
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