The automated COSC-Licensed PF441 chronometer motion that this Parmigiani classic runs on offers a 55-hour energy reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and may be admired throughout the sapphire crystal caseback. And admire it you may, since it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/