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