The automated COSC-certified PF441 chronometer motion that this Parmigiani classic runs on offers a fifty five-hour electrical power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and might be admired through the sapphire crystal caseback. And admire it you will, as it displays some https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/