The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani classic runs on provides a fifty five-hour ability reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired through the sapphire crystal caseback. And admire it you will, because it shows some of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/