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