The automated COSC-Licensed PF441 chronometer movement that this Parmigiani classic operates on provides a 55-hour electricity reserve, owing to its oscillating mass, and that is in delicately engraved gold, and can be admired throughout the sapphire crystal caseback. And admire it you can, mainly because it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/