The automatic COSC-certified PF441 chronometer movement that this Parmigiani classic runs on offers a 55-hour electrical power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and might be admired through the sapphire crystal caseback. And admire it you are going to, as it displays many https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/