The automated COSC-Qualified PF441 chronometer movement that this Parmigiani common operates on provides a 55-hour power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired from the sapphire crystal caseback. And admire it you might, since it displays several of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/