The automated COSC-Licensed PF441 chronometer motion that this Parmigiani vintage operates on offers a 55-hour electrical power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired from the sapphire crystal caseback. And admire it you may, because it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/