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