The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani vintage runs on provides a 55-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired throughout the sapphire crystal caseback. And admire it you are going to, as it displays some of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/