The automated COSC-Qualified PF441 chronometer motion that this Parmigiani typical operates on offers a fifty five-hour electrical power reserve, owing to its oscillating mass, which is in delicately engraved gold, and can be admired in the sapphire crystal caseback. And admire it you might, mainly because it displays a number https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/