I was checking out an old power line which was used to service a reservoir pumping station when I came across these on a downed pole. The one on the left has the Westinghouse logo on the top, the one on the right has "LIGHTNING ARRESTOR/LINE MATERIAL CO./MILWAUKEE WIS." ink stamped on it. Also has the Jeffery-Dewitt logo (JD in a circle) stamped on it. Both have the brackets for mounting onto a crossarm. Feel free to contact me if anyone is interested in these. Note: I only have the Westinghouse arrestor left, the other has been sold.