The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani traditional operates on offers a 55-hour ability reserve, owing to its oscillating mass, that is in delicately engraved gold, and can be admired in the sapphire crystal caseback. And admire it you will, because it displays many of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/