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 in the sapphire crystal caseback. And admire it you'll, as it shows a number of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/