The automated COSC-certified PF441 chronometer movement that this Parmigiani traditional runs on provides a fifty five-hour energy reserve, owing to its oscillating mass, that's in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you can, as it shows several of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/