The automatic COSC-certified 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 might be admired throughout the sapphire crystal caseback. And admire it you are going to, because it shows a https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/