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