I would advise against sourcing a replacement bezel yourself. Rather, find reputable Omega-certified watchmakers in your area and ask around with them. They'll probably have replacement parts for SMDVs, and if not, will know where to get them for you. I suspect you haven't had your SMDV serviced in a very long time as well, so while you're at it you can have that done too.
Apart from the missing bezel, your SMDV looks to be in great condition, given its age. Wear it with pride!
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