The automated COSC-Accredited PF441 chronometer motion that this Parmigiani typical runs on offers a 55-hour energy 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'll, because it displays a lot of the very best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/