The automated COSC-Qualified PF441 chronometer movement that this Parmigiani common operates on provides a 55-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you'll, because it shows several of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/