Google Omega 4500.50.00. It's a De Ville Prestige. I found plenty of pics of this watch. Some on apparently legit watch seller sites, and some on replica sites. Trouble is, my untrained eyes can't distinguish a difference between any of them and this one here. But because he has a genuine box and cards, it might be revealing to know whether the watch's serial # matches the warranty card...which he doesn't show us. If the numbers match, and especially if the card has a date and dealer stamp, I'd say the watch is legit.
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