The automated COSC-Licensed PF441 chronometer movement that this Parmigiani traditional runs on offers a 55-hour ability reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired from the sapphire crystal caseback. And admire it you may, since it displays a number of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/