The automated COSC-Accredited PF441 chronometer movement that this Parmigiani vintage runs on provides a fifty five-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and may be admired in the sapphire crystal caseback. And admire it you may, as it displays a few of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/