The Seiko Prospex GMT SPB381J pays homage to Seiko's pioneering 1968 hi-beat one-piece Diver’s watch, which marked a significant milestone in Japanese watchmaking. This model's success established the foundation for Seiko's continuous innovation in diver’s watches over six decades, providing both professional and recreational divers with precise and reliable timepieces. Powered by the new in-house Calibre 6R54, it represents Seiko's first venture into mechanical GMT functionality within its diving watch series. - Calibre 6R54 - 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 - 12.9mm Case Thickness - Stainless Steel Case and Bracelet - Sapphire with Anti-Reflective Coating on the Inside - Screw Down Crown - One Way Ceramic Rotating Bezel - Dual Time: G.M.T Hand can be set on second time zone - Drivers 200 Meters Water Resistant