The automatic COSC-certified PF441 chronometer motion that this Parmigiani vintage runs on offers a 55-hour electricity 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'll, because it shows a lot of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/