The automatic COSC-certified PF441 chronometer motion that this Parmigiani classic runs on provides a 55-hour electrical power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired with the sapphire crystal caseback. And admire it you are going to, mainly because it https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/