The automated COSC-Licensed PF441 chronometer movement that this Parmigiani vintage operates on offers a 55-hour electric power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and will be admired throughout the sapphire crystal caseback. And admire it you can, as it shows a few https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/