$0 to $1200 This old of machine will sell on condition only, not on a mythical blue book value.
I own an AT0875-09E, and can report that the crown does not screw down, although the watch is WR200. I have swum with it with no problems.
According to my calculations, It's around 8.5 minutes per Kilometer to 9.5 minutes per Kilometer. I don't think this is even possible to achieve by running on land even. ----That speed is about correct (i checked his time records), however that is just over 4 miles per hour. Sprinters can go faster than 25 miles per hour. Use the Google calculator. Ex: Phelps 200 meter Fly in 1:52:03 This is 1.8709 minutes, At Google box type in: convert 200 m per 1.8709 minutes to miles per hour