The automated COSC-Accredited PF441 chronometer motion that this Parmigiani typical operates on provides a fifty five-hour energy reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you will, because it displays a lot https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/