Just found this- https://omegaforums.net/threads/of-...old-capped-omega-c-shape-constellation.60122/
So i think it's a 1960's 166.017
you're going to need much better pictures if you intend to purchase (or attempt a valuation )
The key to assessing C-cases (other than making sure the dial is ok of course) is the orbital finish on the case and the mirror facets on the edge of the case.
Bezels often have a radial finish but there are so many out there with a plain finish that it is possible that this may have been an option too.