The automatic COSC-Licensed PF441 chronometer movement that this Parmigiani vintage operates on provides a fifty five-hour electricity reserve, owing to its oscillating mass, that is in delicately engraved gold, and may be admired throughout the sapphire crystal caseback. And admire it you may, because it displays some of the best https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/