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, which happens to be in delicately engraved gold, and might be admired in the sapphire crystal caseback. And admire it you can, since it shows a number https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/