The automated COSC-Licensed PF441 chronometer motion that this Parmigiani typical operates on offers a 55-hour electric power reserve, owing to its oscillating mass, that is in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you are going to, because it displays a lot https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/