The automated COSC-certified PF441 chronometer movement that this Parmigiani vintage runs on provides a 55-hour ability reserve, owing to its oscillating mass, that is in delicately engraved gold, and might be admired through the sapphire crystal caseback. And admire it you will, as it displays some of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/