It is not from the 40's, because the Omega logo is not printed but applied. It looks like an Omega ambassador, Omega first automatic model.
If it is 33 mm, it has a 28.10 RA mvt, if it is 35 mm, then it has 30.10 RA mvt. Reference should be either 2374 (35 mm) or 2375 (33 mm).
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