I don't see anything to suggest an out and out fake. The case has certainly been way over polished and the dial looks too good to be true ..i'm wondering about the stick on logo..it raises questions (redial?) .The only way in to see the serial number (not the model ref number) is to pop the glass off, and get in that way. You'll probably find a cal 565 movement..which is a bit of a classic! .You sure you want to do this? These are fairly common Omega watches and are at the lower spectrum of value and collectability..you can get good quality vintage ones with more uncommon dials and original bracelets (if you're lucky) for around 275-400 Euros.
That said, I have a soft spot for Cosmics and I also like the design.
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