I need some help. I thought this was genuine and the bracelet looks original, but noticed the crown isn't marked and the "1020" is printed inside a circle on the movement (instead of engraved) which I haven't seen in my research. Any info is greatly appreciated.
Hi, the watch is genuine. The crown is a generic replacement one. In movements from the 70s Omega had the number in a little circle like that, before that they were engraved. Watch isn't one in high demand so you shouldn't be spending to much on it.
This is not a bumper, but, yes, the rotor and auto-wind assembly is missing. Serial number, below OMEGA and above SWISS within the little circle, dates this to ca 1972.