The automated COSC-certified PF441 chronometer motion that this Parmigiani basic runs on provides a 55-hour power reserve, owing to its oscillating mass, which is in delicately engraved gold, and will be admired throughout the sapphire crystal caseback. And admire it you can, because it displays several of the finest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/