The automated COSC-certified PF441 chronometer motion that this Parmigiani traditional runs on provides a fifty five-hour energy reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you will, because it shows many of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/