The automated COSC-Qualified PF441 chronometer movement that this Parmigiani vintage operates on offers a 55-hour energy reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you may, as it shows several of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/