The automatic COSC-certified PF441 chronometer motion that this Parmigiani vintage runs on provides a fifty five-hour electric power reserve, owing to its oscillating mass, that is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you might, as it displays some of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/