Prospex Marinemaster 1968 Heritage Diver's Watch Prospex Marinemaster 1968 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. A streamlined and updated homage to Seiko’s landmark 1968 diver’s watch, this extraordinary timepiece is part of the high-intensity Marinemaster collection, complete with special features designed to enhance safety for intrepid divers. As a result of the skillful control of color and texture, the high contrast between the dial and indices provides improved visibility for a professional tool while the subtle pattern provides an appealing luxury feel. The uniquely textured black dial features LumiBrite coating on the hands, markers and 12 o’clock marker on the black uni-directional rotating elapsed timing bezel for superior visibility in low-light conditions. In addition, there is deeper knurling on both the bezel edge and the screwdown crown for ease of use. Further enhancing the legibility, the dual-curved sapphire crystal features anti-reflective coating on the inner surface.