The automatic COSC-Accredited PF441 chronometer movement that this Parmigiani basic runs on provides a 55-hour energy reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired in the sapphire crystal caseback. And admire it you may, because it shows many of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/