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