The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani classic runs on offers a 55-hour electrical power reserve, owing to its oscillating mass, which is in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you may, since it displays some of the finest https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/