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