The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani classic operates on offers a fifty five-hour electrical power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired from the sapphire crystal caseback. And admire it you will, mainly because it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/