Technical description: Rosewood with german silver ferrules and keywork. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Original numbered ebonite mouthpiece. Curved speaker with chimney on front of the instrument. Long tailed British throat A♭ key. Ebonite bushed R2 and R3 tone-holes. C sharp mechanism. 12 keys, 2 rings.
L0: T; speaker.
L1: T; throat A♮; throat A♭.
L3: T; cross E♭₄/B♭₅.
L4: C♯₄/G♯₅; E₃/B♮₄; F♯₃/C♯₅.
R1: T; side F₄/C₆; side trill key for throat A-B♮ and B♭-C.
R2: T + spectacle.
R3: T + spectacle (forked B♭₃/F♮₅); cross B♭₃/F♮₅.
R4: G♯₃/E♭₅; F₃/C₅.
Keyhead type: modern.
Keymount type: screwed in pillars.
Playing accessories: ligature and reed-cap.
With one double case with clarinet in B♭ (4969).