The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani classic runs on offers a 55-hour power reserve, owing to its oscillating mass, that's in delicately engraved gold, and may be admired throughout the sapphire crystal caseback. And admire it you will, as it shows some of the best decoration that https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/