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