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