The automatic COSC-certified PF441 chronometer movement that this Parmigiani traditional runs on provides a fifty five-hour electrical power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you may, mainly because it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/