The automatic COSC-certified PF441 chronometer movement that this Parmigiani common runs on offers a fifty five-hour power reserve, owing to its oscillating mass, that's in delicately engraved gold, and can be admired with the sapphire crystal caseback. And admire it you will, as it displays several of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/