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