The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani typical runs on provides a 55-hour 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, since it shows some of the finest decoration that https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/