The automatic COSC-certified PF441 chronometer movement that this Parmigiani classic operates on provides a 55-hour energy reserve, owing to its oscillating mass, which is in delicately engraved gold, and can be admired in the sapphire crystal caseback. And admire it you are going to, because it displays a lot of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/