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