Is this an original piece? Never seen an Omega with out a caliber number. What is the number on the case a serial or case number?
I'm not sure when omega started using calibre numbers, I think about 1948/9 and the movement number looks to be a 1944 model. It's also got exposed springs so it would be an early version. The experts need to look at this but I'm guessing a 30.10 which I think became a cal.331. Please keep updating as this is interesting.
The caliber is engraved underneath the balance wheel. Almost impossible to photograph when the watch is running. Easy to see in person. gatorcpa
The crown from the watch shown with dial and the crown on the watch shown with the movement are not the same! I would stay away from it.
The crown is the same, just the lighting/reflection causing the difference. However, the dial appears to have been refinished, so deal or no deal depends more on the price, e.g. less than the scrap value would certainly be a good deal.
It is a calibre 330 (30.10 RA PC AM 17p). This is the first production Omega automatic calibre. The number inside the caseback is the case number, which was used on solid gold watches into the early 1950s. And yes, the dial is refinished.