The automated COSC-Licensed PF441 chronometer movement that this Parmigiani traditional operates on offers a 55-hour electrical power reserve, owing to its oscillating mass, that's in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you will, because it displays many of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/