The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani common runs on offers a fifty five-hour electrical power reserve, owing to its oscillating mass, that is in delicately engraved gold, and might be admired in the sapphire crystal caseback. And admire it you are going to, mainly because it shows https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/