The automated COSC-Licensed PF441 chronometer motion that this Parmigiani typical runs on provides a fifty five-hour electric power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you are going to, as it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/