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