Also, the case has been heavily polished, the edges of the lugs are completely gone. The clasp is a cheap fake, not an actual Omega product.
In the current state, the value to collectors would be in the parts. With the case condition and the dial being repainted, that's maybe 200€ or so left, I'm afraid. Mind you, that doesn't mean it wouldn't fetch more in an eBay auction.
Stay around, read through the forum and look at other examples. You'll soon start to see the flaws with this example. We call that "noob tax", the early, uninformed purchases, and you're definitely not alone.