The Seiko Prospex SPB299J draws inspiration from Seiko's 1968 Diver's 300m watch, which was the first and set the highest world standard for hi-beat caliber divers—a significant milestone in Seiko's sixty years of pioneering diving watch innovation. It was worn during the first Japanese ascent of Mount Everest. - Calibre 6R35 - Automatic - Powered by The Movement of The Wearer - Accuracy +25 -15 seconds a DAY(at normal temperature range (5°C and 35°C) - 42mm Case Size - 12.4mm Case Thickness - Stainless Steel Case and Bracelet - Sapphire with Anti-Reflective Coating on the Inside - Screw Down Crown - Divers 200 Meters Water Resistant