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