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