The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani vintage operates on provides a fifty five-hour energy reserve, owing to its oscillating mass, that's in delicately engraved gold, and might be admired in the sapphire crystal caseback. And admire it you are going to, mainly because it shows a number https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/