The automated COSC-Qualified PF441 chronometer motion that this Parmigiani vintage operates 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 throughout the sapphire crystal caseback. And admire it you might, as it displays some of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/