The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani basic runs on provides a fifty five-hour energy reserve, owing to its oscillating mass, that is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you will, as it shows several of the finest https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/