The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani vintage operates on provides a 55-hour electric power reserve, owing to its oscillating mass, that is in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you may, mainly because it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/