The automated COSC-Licensed PF441 chronometer motion that this Parmigiani common runs on offers a 55-hour electric power reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired from the sapphire crystal caseback. And admire it you will, mainly because it displays several of the best https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/