The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani classic operates on offers a 55-hour electric power reserve, owing to its oscillating mass, that is in delicately engraved gold, and might be admired throughout the sapphire crystal caseback. And admire it you'll, since it displays many of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/