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