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