The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani basic operates on offers a 55-hour electrical power reserve, owing to its oscillating mass, that is in delicately engraved gold, and may be admired through the sapphire crystal caseback. And admire it you will, because it shows several of the finest https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/