The automated COSC-Licensed PF441 chronometer movement that this Parmigiani traditional operates on offers a 55-hour electric power reserve, owing to its oscillating mass, that's in delicately engraved gold, and can be admired in the sapphire crystal caseback. And admire it you are going to, since it shows a lot of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/