1968 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. Recalling Seiko's part in the Japanese Antarctic Research Expeditions (JARE), this exceptional timepiece is available only in a limited edition of 1,300, with the serial number engraved on each caseback. A portion of the limited edition will be donated to contemporary researchers, including those dedicated to saving the endangered polar ice sheets suggested by the blue gradated dial. Re-interpreting Seiko's renowned 1968 diver's watch, with updated technology, sleeker lines and fine Zaratsu polishing, this extraordinary watch is crafted of Seiko's Ever-Brilliant Steel, offering an exceptional level of corrosion resistance and a lighter, brighter finish. The caliber 8L35 26-jewel automatic movement, crafted at Seiko's Shizukuishi watch studio with the increased torque necessary for diving, beats at a frequency of 28,800 vibrations per hour, with a power reserve of approximately 50 hours, and provides manual winding capability. Following ISO standards for scuba diving to depths of up to 200 meters, this superbly functional watch includes a date calendar, LumiBrite markers and hands for enhanced legibility, dual-curved anti-reflective sapphire crystal, screwdown crown and caseback, black uni-directional rotating elapsed timing bezel with LumiBrite indicators, and a black silicone strap, as well as an additional blue Seichu fabric diver's strap. Packaged in a Limited Edition collectors' box. 200m Water Resistant