The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani common operates on offers a 55-hour power reserve, owing to its oscillating mass, which can be in delicately engraved gold, and might 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/