The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani vintage runs on provides a fifty five-hour electric power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired with the sapphire crystal caseback. And admire it you can, mainly because it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/