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