Not necessarily. You are assuming that changing the bezel is all Omega has included in that price. The OP could confirm, but the reality is they likely won't do this without a full service of the movement, replacement of pushers, crown, correctors, refinishing - the whole complete maintenance service, plus the cost of the new bezel. If this is what is being quoted for $850, it's a perfectly reasonable price for that work.
If the OP wants someone else to do just the bezel swap, they need to find someone who can get the bezel and is willing to replace it without doing a full service. This might be difficult, because myself and many other watchmakers won't do partial repairs. I could go into the reasons why, but let's just say the reasons are justified.
Also, calling this a simple job might be overstating how easy it is. The bezel on this watch is not like the one on a Speedmaster Pro that is just an external case part that can be changed without opening up the watch. These 7750 based automatic Speedmasters are quite different. It's certainly not difficult for a watchmaker to do, but it's far from a 5 minute job that replacing a Speedy Pro bezel would be. Here is how a bezel is exchanged on a similar model:
The bezel remover is used to separate the bezel from the case frame:
You will note that the crystal comes with the bezel, and does not stay on the case:
Unless you are replacing the crystal also, it has to be pressed out of the bezel:
Then the crystal gasket is replaced, and the crystal is pressed into the new bezel:
The gasket that goes under the bezel is replaced:
The movement is mounted (need this in place to accurately line up the bezel):
Then the bezel is pressed in place:
Cheers, Al
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