The automated COSC-Accredited PF441 chronometer motion that this Parmigiani traditional runs on provides a 55-hour electricity reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired throughout the sapphire crystal caseback. And admire it you might, as it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/