During production, there are occasional coating flaws/ minor scratches on some finishes. The manufacturer deems these items as Factory Irregular (FIR), places a stamp on the product. ALL FIR's carry the same warranty as regular products. They are functionally the same.
This batch of RD8-II Factory Irregular has slightly larger friction than regular version.
This new second generation RD8-II is designed to be used with the Ultimate M2 series heads. It has precise click stops at 30, 15, 6, 5, 4, 3, 2.5, 2 to support up to 700mm equivalent focal length with camera in landscape orientation, or 465mm equivalent in portrait orientation.