The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani classic runs on provides a 55-hour energy reserve, owing to its oscillating mass, which is in delicately engraved gold, and may be admired through the sapphire crystal caseback. And admire it you are going to, as it shows some of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/