The automated COSC-Accredited PF441 chronometer movement that this Parmigiani common operates on provides a 55-hour electric power reserve, owing to its oscillating mass, that is in delicately engraved gold, and can be admired in 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/