The automatic COSC-Accredited PF441 chronometer motion that this Parmigiani basic runs on offers a fifty five-hour power reserve, owing to its oscillating mass, which is in delicately engraved gold, and might be admired from the sapphire crystal caseback. And admire it you might, as it displays several of the finest https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/