The automated COSC-certified PF441 chronometer motion that this Parmigiani vintage runs on provides a 55-hour energy reserve, owing to its oscillating mass, which is in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you'll, because it displays a few of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/