The automated COSC-certified PF441 chronometer movement that this Parmigiani vintage operates on provides a fifty five-hour electric power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and might be admired with the sapphire crystal caseback. And admire it you might, because it shows a lot https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/