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