Seiko SRPG21 Prospex Special Edition Automatic Diver Watch. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and winning design. Inspired by Seiko’s most iconic diving styles, this distinctive Special Edition features deep 3D-pressed design in a striking black dial for increased legibility underwater. For reliable timing in rough waters, the 23-jewel automatic movement beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 41 hours, and can be wound manually or automatically. Featuring a magnified date calendar and LumiBrite hands and markers, the dial is framed by a black ceramic uni-directional rotating elapsed timing bezel. In stainless steel, with secure screwdown crown and caseback, anti-reflective sapphire crystal and deep blue silicone strap, this high-intensity timepiece follows ISO standards for scuba diving. Water-resistant to 200 meters.