Bringing together technical excellence and elegant sophistication, the Grand Seiko Heritage collection features a stunning range of long-cherished watches that are perfect for every occasion. Exterior Case Material : Stainless steel Glass Material : Dual-curved sapphire crystal Glass Coating : Anti-reflective coating on inner surface Case size : Diameter 40mm × Thickness 13. 3mm Clasp type : Three-fold clasp with push button release Functions Water resistance : 10 bar Magnetic resistance : Equipped Weight : 154. 0 g Other details/Features: 37 jewels Case back with lion emblem Date display Screw case back Screw-down crown See-through case back Stop seconds hand function Calibre 9S85: The challenge of making a high-beat movement is one that only a few watchmakers choose to accept. With its higher oscillation rate of ten beats per second, greater accuracy is achievable, but this increased precision comes at a price because the faster rotational speed can take its toll on the power reserve