Here is a nice original Bakelite Kellogg  telephone mouthpiece that would look good  on your wooden wall telephone or your candlestick telephone. Comes polished.

 This will thread in with ease.

 15/16" 18tpi    Also fits Dean, North, Modern, Manhattan, Couch, Ericsson (Corase), Utica Fire Alarm, Voight Berger  (Fine), Swedish American.

 These are original Kellogg Bakelite mouthpieces in pristine condition.

Comes polished.