The automatic COSC-Accredited PF441 chronometer movement that this Parmigiani classic runs on offers a 55-hour electric power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired with the sapphire crystal caseback. And admire it you will, mainly because it shows some https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/