The automated COSC-certified PF441 chronometer motion that this Parmigiani classic runs on offers a fifty five-hour electric power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and may be admired in the sapphire crystal caseback. And admire it you may, mainly because it shows a https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/