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