The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani basic runs on provides a fifty five-hour electrical power reserve, owing to its oscillating mass, which happens to be in delicately engraved gold, and may be admired throughout the sapphire crystal caseback. And admire it you can, as it shows a https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/