The automatic COSC-certified PF441 chronometer movement that this Parmigiani vintage runs on offers a 55-hour electrical power reserve, owing to its oscillating mass, which can be in delicately engraved gold, and might be admired in the sapphire crystal caseback. And admire it you are going to, since it shows a https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/