The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani typical runs on provides a fifty five-hour power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired from the sapphire crystal caseback. And admire it you'll, as it shows a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/