The automatic COSC-Accredited PF441 chronometer movement that this Parmigiani common runs on provides a 55-hour energy reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and will be admired from the sapphire crystal caseback. And admire it you are going to, as it shows some https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/