The automated COSC-Licensed PF441 chronometer movement that this Parmigiani basic operates on provides a fifty five-hour energy 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'll, as it shows a few of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/