The automated COSC-Qualified PF441 chronometer movement that this Parmigiani common operates on provides a 55-hour electric power reserve, owing to its oscillating mass, that's in delicately engraved gold, and may be admired through the sapphire crystal caseback. And admire it you'll, mainly because it displays several of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/