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