From what I can see, you appear to have a mid-50s Omega Constellation case ref 2852 with the 505 movement. It's not possible to be any clearer from one fuzzy photo, but if as at first glance appears all is original and the dial has not been repainted, that is a very collectable watch. I recommend you post clearer pictures of the front, back and crown (= winder).
Don't try wearing it without having it serviced first as dried up lubricants from long ago will cause wear to the movement. It requires work by a skilled watchmaker who understands vintage pieces. That won't be cheap but it's a high-quality watch and well worth it. DON'T send it to Omega whatever you do. If it is a family piece, or if you have any feeling for vintage watches, keep this one if you can. They are not easy to come by and after a little research, you'll realise that this was one of the finest and most attractive watches ever made. Search Desmond Constellation blog for as much information as you can handle.
Now please prove you are not one of those awful drive-by valuation posters by sticking around and showing us some nice photos!
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