I allow myself to paste here our conversation in PM because it may interest other readers.
I really like the cosmic model because it's robust, elegant and discreet, and the prices are moderate. it's an easy-to-retain model ideal for starting a collection.
here is what we can say about the model that interests you:
- the dial is fine, clean, not repainted
- the glass is not original, it should have a bubble on the date. Omega still has this glass in stock. you have to go through an approved Omega watchmaker. the glass will cost about $100
- the case has been polished, the front should be brushed in a ray of sunshine. it is possible to redo this effect. another $100. (be careful to choose your watchmaker well!)
- Too bad we can't see the mechanism. you have to go through the glass to open the watch and have a special tool (n°107).
- the original strap buckle has disappeared (around $50)
now it all depends on the price you are being offered.
without a specific revision date, consider it not done (250/300$)
For me it's a watch at around $300. it's not a rare watch, so if you're in doubt, keep fishing. there are dials that can give more originality.
the important thing is to know the object you are buying, its qualities and also its faults so as not to be disappointed when you discover them (the dial is fine IMO).
For me, $400 is a maximum price for this watch.