The automated COSC-Qualified PF441 chronometer movement that this Parmigiani vintage runs on offers a 55-hour power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and can be admired from the sapphire crystal caseback. And admire it you are going to, since it displays several of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/