The automated COSC-certified PF441 chronometer movement that this Parmigiani vintage runs on provides a 55-hour electric power reserve, owing to its oscillating mass, that is in delicately engraved gold, and may be admired with the sapphire crystal caseback. And admire it you can, as it displays a lot of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/