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