1970 Heritage 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. Following ISO standards for scuba diving at depths of up to 200 meters, this exceptional timepiece is powered by a 26-jewel caliber 8L35 automatic movement designed for increased torque and assembled expressly for diver’s watches at the Shizukuishi Watch Studio, with a frequency of 28,800 vibrations per hour, a power reserve of approximately 50 hours, and manual or automatic winding. The textured gray dial includes a date calendar, with LumiBrite coating on the hands, markers and bezel ring accents. Crafted of stainless steel with super-hard coating, this high intensity watch features a screwdown crown and caseback, as well as a curved sapphire crystal with anti-reflective coating on the inner surface, black one-way rotating elapsed timing bezel, and tri-fold push button release clasp with secure lock and extender. 200m Water Resistant