The automated COSC-certified PF441 chronometer movement that this Parmigiani basic runs on offers a 55-hour electrical power reserve, owing to its oscillating mass, that's in delicately engraved gold, and may be admired throughout the sapphire crystal caseback. And admire it you'll, since it shows a number of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/