Bringing together technical excellence and elegant sophistication, the Grand Seiko Heritage collection features a stunning range of long-cherished drive watches that are perfect for every occasion. Epitomising elegance and class the SBGP013, featuring a sleek stainless steel bracelet and case and sophisticated dark blue dial. Batons feature as watch markers for a seamless look. Exterior Case Material : Stainless steel Glass Material : Sapphire crystal Glass Coating : Anti-reflective coating on inner surface Case size : Diameter 40mm × Thickness 10.6mm Clasp type : Three-fold clasp with push button release Functions Water resistance : 10 barMagnetic resistance : Equipped Weight : 148.0 g Other details / Features: Calendar-linked time difference adjustment function Caseback with lion emblem Date display Screw case back Caliber 9F85: Caliber 9F85 has a time difference adjustment function that allows the hour hand to be adjusted without stopping the seconds hand and thus preserving its high precision when the wearer changes time zones. Accuracy ±10 seconds per year Battery life Approximately 3 years Features - Instant date change mechanism - Quick correction function of time difference adjusting to a calendar