The automated COSC-Qualified PF441 chronometer motion that this Parmigiani basic operates on provides a 55-hour power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and can be admired from the sapphire crystal caseback. And admire it you may, because it displays several of the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/