The automated COSC-Licensed PF441 chronometer motion that this Parmigiani traditional operates on provides a 55-hour electric power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired with the sapphire crystal caseback. And admire it you are going to, mainly because it https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/