The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani classic operates on offers a fifty five-hour ability reserve, owing to its oscillating mass, which is in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you are going to, since it displays a lot https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/