Clarinet. Nominal pitch: B♭.

Technical description: Blackwood with silver plated german silver ferrules and keywork. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Sharing original ebonite mouthpiece with (4917). Throat B♭ vent from Akey. Extra vent for throat F♯ on L2. Plate for R1 with a connection to upper section closing two tone-holes in order to give an in-tune B₃/F♯₅. One extra throat G-A♭ trill key. Vent hole in bell through tenon of lower section. Disconnectable Csharp mechanism. Joint between sections lined with german silver. 19keys, 5rings, 1plate, 4black rollers. L0: T; speaker. L1: T + ring + vent; throat A♮; throat A♭. L2: T + ring + vent; F♯₄ vent; alternative cross key for F₄/C₆. L3: T + ring; E♭₄/B♭₅. L4: C♯₄/G♯₅; E₃/B♮₄; F♯₃/C♯₅; alternative lever for B♭₃/F₅; alternative lever for G♯₃/E♭₅. R1: Plate + correspondence; side F₄/C₆; side E♭₄/B♭₅; side trill key for throat G-A or C₆-D₆; side trill for throat A-B♮ and B♭-C; side trill key for throat G-A♭. R2: T + ring + vent. R3: T + ring (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.