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