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