Paying homage to Seiko's first 1965 diver's watch. This new timepiece also echoes the design of the 1965 original, but is thoroughly up-to-date in it's functions and meet Seiko's stringent standards for diver's watches. The hands are wider and carry long-lasting Lumibrite so as to be highly legible even in dark water. The water resistance has been increased to 200 meters and the crystal is sapphire for greater strength and durability and has an anti-reflection coating. The watch sits perfectly on the wrist and the Zaratsu polished line on the case side adds a touch of contemporary refinement. Featuring an accordion-style silicone strap which combines high durability and comfort. The accordion-style strap was invented by Seiko in 1975 as a solution to the problem of the expansion and contraction of a diver's wrist at different depths.