The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani vintage runs on offers a fifty five-hour electrical power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you may, since it shows a https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/