The automatic COSC-certified PF441 chronometer movement that this Parmigiani classic runs on provides a fifty five-hour electrical power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and might be admired throughout the sapphire crystal caseback. And admire it you can, because it shows some of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/