The automatic COSC-Licensed PF441 chronometer motion that this Parmigiani common runs on offers a 55-hour electrical power reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired in the sapphire crystal caseback. And admire it you may, mainly because it shows a lot of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/