The automated COSC-Accredited PF441 chronometer movement that this Parmigiani typical runs on offers a fifty five-hour power reserve, owing to its oscillating mass, which is in delicately engraved gold, and might be admired throughout the sapphire crystal caseback. And admire it you'll, because it shows some of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/