At a guess I'd agree with the above 250-400 range, depending on the buyer, the pics, the watch condition (naturally), any docs/papers you might have, etc. I will take a leap and say the Seamaster MIGHT go higher if mint, IF the right buyer was found. Not overly likely, but the few people I've known with that model loved them; I've never had one myself, so it's pure speculation on my part.