This is the company that does the authentication in the US:
https://www.americaswatchmaker.com
I am no fan of eBay authentication, but I doubt that many "fakes are getting through" TBH in the context of modern watches from a major brand like Omega. A counterfeit watch is not that convincing once an expert puts their hands on it, opens it up, and looks under magnification. It's not the same as sports memorabilia where you are mainly focused on provenance. Here we are talking about unique products with distinctive designs, manufacturing, and technology. And there is a guarantee, as you read in the T&C, so you are protected.
Still, I agree that it's always best to develop your own expertise, but you will still need to rely on some sort of guarantee if you don't trust the seller, since there is only so much you can tell from photos.
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