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