Grand Seiko Heritage Black Dial GMT SBGJ203 3 ase Material : Stainless Steel Case Diameter : 40mm Case Thickness : 14mm Case Length : 46.2mm Lug Width : 19mm Dial Color : Black Crown : Screw Down Strap/Bracelet : Stainless Steel w. three-fold clasp Crystal : Dual Curve Sapphire Caseback : Stainless Steel with Sapphire Crystal