The automated COSC-certified PF441 chronometer motion that this Parmigiani basic runs on provides a 55-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and can be admired through the sapphire crystal caseback. And admire it you'll, since it shows a lot of the finest https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/