The automated COSC-Qualified PF441 chronometer movement that this Parmigiani classic operates on offers a 55-hour ability reserve, owing to its oscillating mass, which is in delicately engraved gold, and will be admired from the sapphire crystal caseback. And admire it you can, as it shows many of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/