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