From the seller's site.....
The case has 18kt gold hallmarks on the outside, on the inside the ref number is extremely light and the Omega hallmarks look laser printed and not as I would expect for a case from the 1940's. Together with inner dust cover and nodules for the attachment of female spring bars it is very clear that this isn't an original Omega case, more like an 18kt 'onion skin' case for a Chronograph Suisse or something like that.
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