The automated COSC-Qualified PF441 chronometer movement that this Parmigiani basic runs on provides a 55-hour electricity reserve, owing to its oscillating mass, and that is in delicately engraved gold, and will be admired from the sapphire crystal caseback. And admire it you are going to, mainly because it shows some https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/