The automated COSC-Licensed PF441 chronometer movement that this Parmigiani traditional runs on offers a 55-hour electric power reserve, owing to its oscillating mass, that is in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you might, mainly because it shows a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/