The automatic COSC-certified PF441 chronometer motion that this Parmigiani vintage operates 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 through the sapphire crystal caseback. And admire it you'll, because it displays many of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/