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