The automated COSC-Licensed PF441 chronometer motion that this Parmigiani vintage operates on provides a fifty five-hour electricity reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and might be admired through the sapphire crystal caseback. And admire it you are going to, because it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/