The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani basic operates on provides a fifty five-hour electrical power reserve, owing to its oscillating mass, that is in delicately engraved gold, and can be admired in the sapphire crystal caseback. And admire it you will, mainly because it displays a lot https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/