Schwartz Etienne is a brand from the early 1900's that was "revived" in the 2000's. They now make their own movements but clearly there was a time when they bought movements from others, such as Lemania - this movement is marked Lemania on the movement plate. So Someone has taken a Lemania movement from some unknown Schwartz Etienne chronograph model, and stuck a Speedmaster service dial and hands on it, and put it into an Omega case.
Cheers, Al
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