The automated COSC-Accredited PF441 chronometer movement that this Parmigiani common operates on offers a 55-hour electricity 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 are going to, mainly because it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/