The automated COSC-certified PF441 chronometer movement that this Parmigiani classic operates on provides a 55-hour electricity 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 displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/