Its vital statistics are as follows: 659 mechanical parts, together with 21 functions and displays, including a perpetual calendar for the next 500 years and a perpetual moon phase display made of polished goldstone, representing a star-studded midnight-blue sky. Working inside the Grande Complication are a chronograph and a highly complex minute repeater strike train with an all-or-nothing piece. This elaborate piece of mechanics chimes out the time in crystal-clear tones, which are activated by a repeating slide on the left-hand side of the case. Two tiny, precision-made hammers are released and strike the time in hours, quarters and minutes on two gongs. The strike train is a technical tour de force. Initially, the chimes were inaudible outside the solid platinum case, so the glass was freely suspended on a platinum membrane to enable it to amplify the vibrations produced by the gongs via the sound transmission pin.