Common fake. Most likely a AS movement in it.
These are often referred to as gas station fakes. The story is in Italy a guy would say he needed money for gas and sell the watch at a “loss” to buy gas.
There are a few signs. Omegas marked anti magnetic don’t exist with one or 2 exception and this is not one. Omega never marked the back of the watch, those marks are always on the inside of the watch and the hallmarks are fakes in this case. It is not an 18k solid case. It might be much lower gold content, brass, or plated, I can’t tell from the pictures. Lastly the font on the dial is wrong as well as the dial design.
Ironically the AS movement is actually pretty decent inside. AS made low cost movements found in low end watches and often fakes. AS also made movements for Tudor(Rolex) and many other more affordable brands.
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