The automated COSC-Licensed PF441 chronometer motion that this Parmigiani classic runs on offers a fifty five-hour power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you may, since it displays a number https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/