The automatic COSC-Accredited PF441 chronometer movement that this Parmigiani vintage runs on offers a 55-hour electrical 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 can, mainly because it shows a few https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/