The automated COSC-Licensed PF441 chronometer motion that this Parmigiani vintage runs on provides a 55-hour power reserve, owing to its oscillating mass, that's in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you may, as it shows a lot of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/