The automated COSC-Accredited PF441 chronometer motion that this Parmigiani basic operates on provides a 55-hour power reserve, owing to its oscillating mass, that is in delicately engraved gold, and might be admired from the sapphire crystal caseback. And admire it you may, since it displays some of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/