I acquired 332 bumper recently with fairly rare two tone case, (rose gold / stainless).
Didn't have tools to check the movement and since it wasn't priced high and no available tools didn't check movement.
Opened case last night and got a surprise. There is no omega logo and caliber on the movement.
Everething else is correct, serial matches production year 1947 and model number is correct on the case back.
I thought maybe logo and cal got erased but looks like it was never there to begin with.