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