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