It doesn't have to be someone authorized by Omega - it's more important that they have the right test equipment.
I don't know what watch you need tested, but this thread will show you the various tests that are done:
https://omegaforums.net/threads/pressure-testing-a-watchco-sm300.45375/
If it's the Mk. II in your avatar, then the dry test is sufficient, and it would not need a high pressure wet test.
Cheers, Al
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