Clarinet. Nominal pitch: A.

Technical description: Blackwood with german silver ferrules and keywork. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Requires a shorter bell than (5470). Equipped with a special split barrel with tuning slide in the centre. Tone-hole for B₃/F♯₅ through lower tenon of upper section. Curved speaker with chimney on front of the instrument. Long tailed British throat A♭ key. Barret action. Csharp mechanism. 1extra trill key. 13keys, 4rings, 4ebonite rollers. L0: T; speaker. L1: T; throat A♮. L2: T + ring; throat A♭. L3: T + ring; cross E♭₄/B♭₅. L4: C♯₄/G♯₅; E₃/B♮₄; F♯₃/C♯₅. R1: T; Barret action (F₄/C₆; E♭₄/B♭₅); side trill key 1-2. R2: T + spectacle. R3: T + spectacle (forked B♭₃/F♮₅); cross B♭₃/F♮₅. R4: G♯₃/E♭₅; F₃/C₅. Keymount type: screwed in pillars. Keyhead type: modern