The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani classic runs on provides a 55-hour electrical power reserve, owing to its oscillating mass, that is in delicately engraved gold, and can be admired throughout the sapphire crystal caseback. And admire it you can, since it shows a number of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/