The automated COSC-certified PF441 chronometer motion that this Parmigiani classic runs on offers a 55-hour electric power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired through the sapphire crystal caseback. And admire it you'll, mainly because it shows a few https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/