The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani typical runs on provides a 55-hour electricity reserve, owing to its oscillating mass, that is in delicately engraved gold, and may be admired with the sapphire crystal caseback. And admire it you'll, because it displays a few of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/