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