The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani vintage runs on offers a fifty five-hour electrical power 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, since it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/