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 is in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you'll, as it shows many of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/