The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani vintage runs on provides a 55-hour electric power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired throughout the sapphire crystal caseback. And admire it you can, since it shows several of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/