Automatic mechanical movement, Calibre 8601. Power reserve approx. 55 hours. Chronometer certified. Annual calendar function with date display automatically adjusting for months of differing lengths until end of February in leap years (requires manual adjustment). Silver dial featuring silver-tone handset and Roman numeral hour markers. Fixed stainless steel bezel. Scratch resistant sapphire crystal glass. Deployment buckle strap, black alligator leather material. Skeleton case back. Round case shape, 41 mm diameter. Water resistance to 100 meters / 330 feet.