Another unreported Westinghouse, as far as I'm aware, only this one is large and porcelain. A friend was in an antique shop near State College PA, and texted me to ask if I had any interest in this insulator. I told him you bet! The measurements are closest to an M-4430. I can't find one like it listed in a Westinghouse catalog, but Elton does list it as a Pittsburg piece. This takes up a little more room than the last Westinghouse I found. Cool piece.