The automated COSC-certified PF441 chronometer movement that this Parmigiani basic runs on offers a 55-hour energy reserve, owing to its oscillating mass, and that is in delicately engraved gold, and might be admired through the sapphire crystal caseback. And admire it you may, because it displays many of the best https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/