The automated COSC-certified PF441 chronometer motion that this Parmigiani common runs on provides a 55-hour electrical power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired through the sapphire crystal caseback. And admire it you might, as it shows a number of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/