The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani common operates on provides a fifty five-hour electric power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you are going to, mainly because https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/