The automated COSC-Qualified PF441 chronometer movement that this Parmigiani typical runs on provides a fifty five-hour power 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 are going to, mainly because it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/