1968 Heritage Diver's Save the Ocean Special 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. Inspired by the intricacies of glacial formation, this Special Edition re-interprets Seiko's landmark 1968 diver's watch with updated technology and sleeker lines for versatile wear, evoking the ice of Antarctica, where Seiko diver's watches became essential equipment for the Japanese Antarctic Research Expedition (JARE). Today, it advances that unique history in support of the Seiko "Save the Ocean" campaign, dedicated to marine conservation. A patterned light blue dial, framed by a deeper blue bezel ring, features a date calendar and large LumiBrite markers and hands for enhanced legibility. The 24-jewel automatic movement beats at a frequency of 21,600 vibrations per hour, with a power reserve of approximately 70 hours, and provides manual winding capability. Crafted of stainless steel with super-hard coating, this superbly functional timepiece includes an anti-reflective sapphire crystal, screwdown crown and caseback, and tri-fold push button release clasp with secure lock and extender, and follows ISO standards for scuba diving to depths of up to 200 meters. 200m Water Resistant