Real or Fake Omega Geneve?

I was browsing in an antique store in Vancouver, Canada when I saw something odd that looked like a 60s or 70s Omega, priced at a little under 200 dollars, and in really good shape. I bought the watch, but when i got home and opened up the case back it looks just like this. I don't know much about omegas from the 70s at all, but it seems to me like it is missing a lot of the stamps on the movement that I have seen on a lot of older Omegas. (especially on the counterweight) :think:

If you need any more info let me know. I'm not too worried, but if it is real, I think I got a very good deal on the piece.
Let me know what you guys think!