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