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