Thank you all for the wonderful advice. I do indeed think I'll get it serviced locally, and probably take it to Stoll & Co, although I noticed they don't list Omega on their "factory authorized repair" page.
Looking at speedmaster101.com was very helpful, and based upon the pictures there I can tell it is a DO90. Some other details I can observe based upon that website is that it has a smooth case-back ("Pre-Moon"), asymmetric case.
I can easily take off the case back with a case-back tool I have. Do you all think it's appropriate for me to try to pry off the dust cover too to determine the serial number? Is there a way to determine the bracelet model?
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