The automatic COSC-certified PF441 chronometer movement that this Parmigiani classic operates on offers a 55-hour electricity reserve, owing to its oscillating mass, that's in delicately engraved gold, and will be admired from the sapphire crystal caseback. And admire it you can, because it displays some of the finest decoration that https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/