The automated COSC-Licensed PF441 chronometer movement that this Parmigiani basic runs on provides a fifty five-hour electrical 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 can, as it shows some of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/