I'm thinking somethings not right. While the movement does closely resembles the ones I've seen, however it seems to me to have some issues. It lacks the Omega symbol above the name. It has no serial number. There is something about the regulator that doesn't quite look right to me and there is no jewel for the center wheel. My personal opinion is that it could be a period fake, although my opinion really doesn't count for much. I am certainly no expert and they did produce watches of different grades so I might be wrong, after all I was wrong once

My wife just pointed something out to me. It looks like the watch has had considerable repair work done to it and some parts may have been replaced by used parts from other watches.