Reproduction mouthpiece for candlestick or wood wall phones. Has 13/16" thread for Automatic Electic faceplates. The Automatic Electric Mouthpiece should also fit on phones for the following types of manufacturers: Chicago, Oxford, Sears Roebuck, Interstate, Wesco, Ericsson (Fine), Julius Andrea, Voight Berger (Fine), Standard, DeVeau, and Montgomery Ward.