The automated COSC-Licensed PF441 chronometer movement that this Parmigiani vintage operates on provides a 55-hour electrical power reserve, owing to its oscillating mass, which is in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you might, mainly because it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/