The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani classic operates on provides a 55-hour energy 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 will, as it displays several of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/