The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani classic operates on provides a 55-hour power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and will be admired throughout the sapphire crystal caseback. And admire it you might, because it shows several of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/