The automatic COSC-Qualified PF441 chronometer movement that this Parmigiani traditional operates on offers a fifty five-hour energy reserve, owing to its oscillating mass, that's in delicately engraved gold, and may be admired in the sapphire crystal caseback. And admire it you'll, as it displays a lot of the greatest decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/