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