The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani common operates on provides a 55-hour electric power reserve, owing to its oscillating mass, which is in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you'll, as it displays some of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/