The automated COSC-Licensed PF441 chronometer movement that this Parmigiani common operates on provides a 55-hour power reserve, owing to its oscillating mass, that's in delicately engraved gold, and can be admired throughout the sapphire crystal caseback. And admire it you can, since it displays some of the finest decoration that https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/