Seiko Prospex Automatic Diver Black DialProspex Automatic Diver Prospex Divers Watch. Designed for those who treat life as the ultimate adventure, Seiko Prospex keeps moving forward, meeting every challenge with technological excellence and winning design. This rugged timepiece features a black uni directional rotating elapsed timing bezel, a clean black dial for easy visibility, and a coordinating silicone strap. The 24 jewel automatic movement beats at a frequency of 21,600 vibrations per