The automated COSC-Qualified PF441 chronometer motion that this Parmigiani classic operates on provides a fifty five-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and may be admired with the sapphire crystal caseback. And admire it you can, because it shows a lot of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/