The automated COSC-certified PF441 chronometer motion that this Parmigiani common operates on offers a 55-hour energy reserve, owing to its oscillating mass, which is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you might, since it displays several of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/