The automatic COSC-Qualified PF441 chronometer motion that this Parmigiani common runs on provides a 55-hour 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, mainly because it shows many of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/