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