Good stuff! Keep it flowing
I'm not sure what the substance on the one barbed point is. It is a layer of some sort, that has partly lifted from the surface of the point.
There are similar grinding marks on the inside of the barb on the point that you are referring to, Jack. Seen directly from the side, the grinding-tool must have been about as narrow as the barb itself. It is smooth on the inside radius, but the inside of the barb has some rough grinding marks.
The inside radius/shape of the barb as seen from the side is fairly similar on both points, although not identical.
The cutting edges and other surfaces of them have finer grinding marks, but none of them are long enough to tell wether they were made by a circular motion.
I think it would be very helpful to have some comparative material that was known to be original. I'm buying most of your arguments, so there are good ground for confusion...

Let me know if other macros are needed.