I searched the USMA library's collection of class rings to see when the typeface first appeared. Very old rings are completly worn down so the words/typface are indistinguishable. I did find one from 1926 with the typefce in question. The builidng in my attached photo example was built in 1931. The timeframe might be helpful. I've searched the web as best I can but am coming up empty. I hope someone with expertise can help.