The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani vintage operates on offers a 55-hour electricity reserve, owing to its oscillating mass, that is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you'll, because it shows a number of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/