The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani classic runs on offers a 55-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and may be admired in the sapphire crystal caseback. And admire it you might, since it shows a number of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/