Movement:Mechanical Automatic, IWC Caliber 5011, Pellaton winding mechanism; diameter 38.2 mm, height 7.44 mm; 44 jewels; 18ꯠ vph; Nivarox spring with Breguet overcoil; Incabloc shock protection; theoretical power reserve 8 1/2 days, mechanically limited to 7 days; soft iron care for protection against magnetic fields