The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani traditional operates on provides a fifty five-hour energy reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired with the sapphire crystal caseback. And admire it you might, since it shows some of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/