The automatic COSC-Accredited PF441 chronometer movement that this Parmigiani common runs on offers a 55-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 will, as it shows several of the best decoration https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/