The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani common operates on provides a 55-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 can, as it displays a number of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/