I was coming to exactly the same conclusion as Don, looks like a solid 18k gold non-Omega case. I don’t recognise the small flag hallmark in the case back, I’m thinking Brazilian flag for want of a better idea? As Xavyth suggests, the case profile is very 5xx which is wrong for a cal 285, and I’m not sure I’ve seen a 285 held into a case directly with screws instead of a normal screw and clamp. It’s an intriguing watch, but overpriced even for solid 18k.
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