Grand Seiko Sport GMT SBGN021G This quartz GMT creation combines form and function deliver the precision, durability and ease of use that are the hallmarks of Grand Seiko. The muscular steel case has a ceramic bezel whose hardness protects it from scratches and ensures its lasting beauty. Exterior Case Material : Stainless steel with ceramic bezel Glass Material : Sapphire crystal Glass Coating : Anti-reflective coating on inner surface Lumi Brite : Lumibrite on hands and indexes Case size : Diameter 40mm × Thickness 13.1mm The perimeter of Band : 203mm Clasp type : Three-fold clasp with push button release Movement Caliber no. : 9F86 Movement Type : Quartz Accuracy : ±10 seconds per year Functions Water resistance : 20 bar Magnetic resistance : Reinforced magnetic resistance equipped Weight : 170.0 g Other details / Features : 24-hour hand (dual time display function) Calendar-linked time difference adjustment function Case back with lion emblem Date display Screw case back Screw-down crown