1970 Heritage Diver's Limited Edition. 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. This extraordinary watch, available only in a limited edition of 5,500, with the serial number engraved on each caseback, continues a celebration of the 55th Anniversary of Seiko's first diver's watch with a reimagining of the famed 1970 model, complete with the iconic case design that revolutionized underwater safety with a recessed crown creating a built-in crown guard at 4 o'clock. With contemporary styling and technology, this masterfully updated design, sleeker and slimmer than the original, is crafted of stainless steel with super-hard coating, and includes a curved anti-reflective sapphire crystal, blue one-way rotating elapsed timing bezel, screwdown crown and caseback, and tri-fold push button release clasp with secure lock and extender, as well as an additional blue-gray silicone strap. The rich marine blue 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