Prospex Automatic Diver's Watch. 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 re-creations and re-interpretations of landmark achievements. Based on an iconic Seiko design, with upgraded materials, this automatic diver's watch is crafted of stainless steel with durable super-hard coating, and offers a black uni-directional rotating elapsed timing bezel in scratch-resistant ceramic, a sapphire crystal with anti-reflective coating on the inner surface, a screwdown crown and caseback, and a tri-fold clasp with push-button release, secure lock and extender. The distinctive press-patterned gradated gray dial features a date calendar and LumiBrite hands and markers. Following ISO standards for scuba diving to depths of up to 200 meters, this exceptional timepiece includes a 24-jewel automatic movement with a frequency of 21,600 vibrations per hour, a power reserve of approximately 70 hours, and manual winding capability. 200m Water Resistant