The automatic COSC-Accredited PF441 chronometer movement 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 can be admired with the sapphire crystal caseback. And admire it you are going to, since it https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/