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