The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani common operates on provides a fifty five-hour electric power reserve, owing to its oscillating mass, and that is in delicately engraved gold, and may be admired from the sapphire crystal caseback. And admire it you will, as it shows a few https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/