There seems to be a confessional tradition of sorts here wherein we own up to dumb mistakes we made when we first got interested. Here's mine, I've been hiding it away from my own eyes for a couple of years now, but today's the day I face up to it. I bought the enclosed calibre 283 in a case that had a passing connection to a C case, and then found that the back is not engraved with the Omega symbol and model number. Ouch. Question one: Looking at the machining it seems unlikely that this is a genuine Omega case to which the back has been change. Back is a bubble style steel snap back with no markings. Is it simply a re-cased movement in a shabby case? Crown is obviously incorrect, the least of my worries. Question two: what case style / model number does it belong to? The OVD seems to suggest CK 2504 or CK 2537. Any opinions on that? Can 'one' be definitive in such a case? The guilloche dial does seem relatively common out there. Question three: what to do with it? I've been keeping my eyes open, but not certain what case I should be hunting down; in any event, this seems incredibly unlikely to show up. So... throw it on eBay? Or, or or? The dial is in pretty good shape, kinda nice looking, I think. Thanks, folks!