“Cleaning rod for the 1879 Argentine rolling block rifle. This rod is a reproduction of the cleaning rod for the three band Modelo Argentino 1879 Rifle. The rod is 34 inches long and has the appropriate course thread a the bottom end to fasten into the cone style cleaning rod stop.
Very good news. When you get it, check whether the thread will actually go into that plate in the action body, below the end of the barrel. A bit of fettling may be necessary.