The automatic COSC-certified PF441 chronometer movement that this Parmigiani vintage operates on offers a 55-hour electricity reserve, owing to its oscillating mass, that is in delicately engraved gold, and will be admired in the sapphire crystal caseback. And admire it you will, as it displays some of the very best https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/