I think they very well could and should be. All 3 match up as far as color and wear. The size is good and the design seems to belong to that period of time. Haven't seen such a watch with that hour hand though. You usually get to see it on pocket watches but it's probably original. It's interesting to see that they put a smaller movement with a spacer inside. Often they were found on ladies watches and rectangle/tank watches but you'll find them in men's watches as well.
Here's a somewhat similar omega from 1939.
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