The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani traditional runs on provides a 55-hour electric power reserve, owing to its oscillating mass, which is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you may, because it shows many of the greatest https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/