The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani traditional runs on offers a 55-hour electrical power reserve, owing to its oscillating mass, which can be in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you may, since it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/