The automated COSC-Accredited PF441 chronometer movement that this Parmigiani traditional runs on provides a 55-hour energy reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired from the sapphire crystal caseback. And admire it you can, because it displays some of the best decoration that https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/