I don't see what reason you have to think it just needs a service. More likely, you're hoping it just needs a service. Using the search function here, you can find Al talking extensively about the problems with the A, B, and C versions of your movement and the residue that can appear on the intermediate escapement wheel of the C which Omega issued re-designed parts to deal with. I have no idea what all that means, but it was enough to steer me away from any watch with those movements, unless the price was low enough that a full service wouldn't put me upside down in the watch. Hopefully, Al will be along soon with actual facts.
Stu
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