This mold may have accompanied, or been made for a small pocket gun commonly found in England. I have one with a worm on the end so they seem to sometimes have had multi use features. The flattened end (long handle) on yours may have also served as a ram rod to tamp down the load in the barrel, since those little guns did not have long barrels. This, in addition to use in a pipe. The knapping feature is a new one to me. Fun little mold; thank you posting it.
Dick