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