The automated COSC-Qualified PF441 chronometer motion 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 in the sapphire crystal caseback. And admire it you might, mainly because it shows some of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/