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