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