The automated COSC-Accredited PF441 chronometer movement that this Parmigiani classic runs on offers a fifty five-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you'll, as it displays many of the best https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/