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