A few pointers to assist you:
The dial says automatic. The movement is manual. That tells you straight off it's wrong for the case.
The movement shows considerable corrosion. Unless a watch is very rare, that should be an instant No. Sixties Geneves like this are neither rare nor very collectable.
The crown [= winder] does not have the Omega logo. It doesn't look like any Omega crown I know.
Whatever has been removed from the back is either an inscription or, more likely, the logo of a different watch brand.
To sum up, the watch is a pile of dogshit. It doesn't matter how cheap it is, don't buy it. Every beginner wants to start with a bargain, but this isn't a bargain. You should not buy a cheap "fixer upper" unless you know exactly what you are doing and have the skills to do it yourself. It is cheaper in the long run to find something decent and pay the going rate for it. It is. It really, really is.
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