1968 Diver's Watch Reinterpretation. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and style. Part of a rich legacy of innovation in high-intensity timekeeping, Prospex continues to celebrate a long history of sports watch excellence with recreations and reinterpretations of landmark achievements. Updating Seiko's revolutionary 1968 diver's watch with more tailored and contemporary lines, this superbly wearable timepiece is crafted of stainless steel with super-hard coating for enhanced durability, and follows ISO standards for scuba diving to depths of up to 200 meters. The high-visibility black dial, framed by a stainless steel one-way rotating elapsed timing bezel, features a date calendar as well as LumiBrite hands and markers. The 24-jewel automatic movement beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 70 hours, and can be wound manually or automatically. With a curved, anti-reflective sapphire crystal, this brilliantly reimagined watch includes a screwdown crown and caseback, and a tri-fold push button release clasp with secure lock and extender. 200m Water Resistant