Yes the movement called out for this is a Cal. 111, which is essentially an ETA 2892. Note that the bezel is no longer available, so Omega won't be able to supply you a new one.
You can use Omega for the service, but be aware that they may change parts on the watch that you may not want changed - like dial and hands. If you want to be sure that those things will stay, find yourself an independent watchmaker with an Omega parts account.
Cheers, Al
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