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. This masterfully updated design is crafted of stainless steel with super-hard coating, and includes a curved anti-reflective sapphire crystal, black uni-directional rotating elapsed timing bezel, and screwdown crown and caseback, as well as a green high-intensity fabric strap and additional gray fabric strap, both made in Japan with superior flexibility, but the strength necessary for diving. The patterned 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 watch offers manual winding capability 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