The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani classic runs on provides a 55-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, as it shows a lot of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/