The automatic COSC-certified PF441 chronometer movement that this Parmigiani traditional operates on offers a 55-hour power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and might be admired from the sapphire crystal caseback. And admire it you might, because it displays some of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/