This is an interesting one. The case looks, as Dennis said, unusual in the stampings, although the responsibility mark looks good and shows the case made by Ed Wenger, a known casemaker for Omega. I'd like to see the outer caseback too and a closeup of the Helvetia mark to see if there is an assay mark below the head.
The watch looks to me like a 368.0810 as the bracelet is factory made and maybe should have that number on the inner clasp. I dont know of a C-Shape with 168.008 (was originally 009 and the 017).
My speculations are that it is a replacement caseback, as it doesnt appear to be a UK, Argentine or Brazilian national production case.
Cheers
Desmond
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