The literature has little to offer regarding this stop. Audsley says: The prefix klein - small, has been employed by German organ-builders in the names of other organ-stops; we, accordingly, find the following: ... Kleinterz (1-3/5 ft.). The prefix is employed to indicate either octave pitch or small scale. Wedgwood says only: �Klein Terz = Octave Tierce�.
Osiris contains only a single example: