Fabulous item. IMHO, overpriced relative to other sets sold. At that price or substantially less you would expect all pieces to be in the original box and to have the original movement in the watch. My read on the description is that the person has assembled these items over time and the movement in the watch may or may not be original. Compass and depth guage usually sell for 4,000-6,000 each depending on age and condition. The watch alone regularly sells for $20,000 or so. All in around $30,000. Matched set in box - $60,00-80,000. I have only seen two or three sell at auction though. Of course the extra dials are worth quite a bit too.
Having said all that, if I had $80,000 hanging around I would be dying to buy it.