The automated COSC-Licensed PF441 chronometer motion that this Parmigiani classic runs on offers a 55-hour energy reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired through the sapphire crystal caseback. And admire it you might, as it displays several of the finest decoration that https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/