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