1968 Diver's Watch Recreation 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 recreations and reinterpretations of landmark achievements. Marking the 55th anniversary of Seiko's first diver's watch by recreating 1968's Hi-Beat, one-piece case, saturation diver, this extraordinary timepiece is available only in a limited edition of 1,100, with the serial number engraved on each caseback. Upgraded with a dual-curved anti-reflective sapphire crystal, it is crafted of Seiko's new Ever-Brilliant Steel, offering an exceptional level of corrosion resistance and a lighter, brighter finish. The rich blue-gray dial, designed to suggest the ocean depths at the point at which blue yields to darkness, features a date calendar and LumiBrite hands and markers. Following ISO standards for diving to depths of up to 300 meters, this saturation diver includes a black one-way rotating elapsed timing bezel, screwdown crown, and secure silicone strap, also in oceanic blue-gray. The proprietary hi-beat, 37-jewel, caliber 8L55 automatic movement, assembled expressly for diver's watches at the Shizukuishi Watch Studio, beats at a frequency of 36,000 vibrations per hour, with a power reserve of approximately 55 hours, and can be wound manually or automatically. 300m Water Resistant.