The automated COSC-certified PF441 chronometer motion that this Parmigiani classic runs on offers a 55-hour power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and might be admired from the sapphire crystal caseback. And admire it you are going to, since it shows some of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/