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