ID on this Omega

The case and crown align with the 1940s, but the hands and especially the dial are from much later (like 1960s).
Maybe the original dial was badly water damaged and was replaced at some time.
This affects collector desirability so many collectors would only see this as a parts donor, but as it's an heirloom the value is of no consequence.

To find out what you actually have, the caseback needs to be removed and photos of the movement and the inside of the caseback will provide the information needed to solve the mystery.