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