The automatic COSC-certified PF441 chronometer motion that this Parmigiani common runs on provides a fifty five-hour electric power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and may be admired in the sapphire crystal caseback. And admire it you'll, as it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/