The Prospex SPB301J Glacier Special Edition 'Save the Ocean' reinterprets Seiko's 1970 Diver's 150m watch, famously worn by Japanese explorer Naomi Uemura from 1974 to 1976 during his epic solo dog sled journey from Greenland to Alaska spanning 12,500km. - 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) - 42.7mm Case Size - 13.1mm Case Thickness - Stainless Steel Case and Bracelet - Sapphire with Anti-Reflective Coating on the Inside - Screw Down Crown - Divers 200 Meters Water Resistant