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