Prospex Automatic Diver. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line follows every challenge with technological excellence and style. A modern reimagining of Seiko's landmark 1968 Diver's Watch, this dynamic design features a stainless steel case and bracelet with super-hard coating for nearly doubled hardness, and comes with an additional black silicone strap. Framed by a black and red rotating elapsed timing bezel, the dark blue sunray-finish dial includes a date calendar and LumiBrite hands and markers, and is topped by a sapphire crystal with anti-reflective coating on the inner surface. The 23-jewel automatic movement beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 50 hours, and can be wound manually or automatically. With screwdown crown and caseback, as well as a tri-fold push button release clasp with secure lock and slide adjuster, this high-intensity timepiece follows ISO standards for scuba diving. 200m Water Resistant.