As above. The short answer is that a replacement bezel is not included in the service cost, it is an extra ~ £200/$300 or so.
Quartz movements are one example where some original parts are not returned as I believe in many cases Omega exchange the movement at a full service and retain the original. I would thonk this is the case with the 1538 used here. You get a new movement but they keep the original. This is not the case of course if you just get a battery service.
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