The automated COSC-Accredited PF441 chronometer motion that this Parmigiani traditional operates on provides a 55-hour energy reserve, owing to its oscillating mass, which is in delicately engraved gold, and may be admired with the sapphire crystal caseback. And admire it you will, because it displays some of the very best https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/