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. With contemporary styling and technology, this versatile timepiece reimagines Seiko's famed 1970 diver's watch, complete with the iconic case design that revolutionized underwater safety with a recessed crown creating a built-in crown guard at 4 o'clock. Sleeker and slimmer than the original, this masterfully updated design is crafted of stainless steel with super-hard coating, and includes a dual-curved anti-reflective sapphire crystal, green one-way rotating elapsed timing bezel, screwdown crown and caseback, and black silicone strap. The sporty green 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 watch can be wound manually or automatically and includes a 24-jewel automatic movement with a frequency of 21,600 vibrations per hour and a power reserve of approximately 70 hours. 200m Water Resistant.