Bass clarinet. Nominal pitch: B♭.

Technical description: Rosewood with brass crook, bell, ferrules and keywork. Five pieces: mouthpiece, crook, upper section, lower section, upturned bell. Original named wooden mouthpiece marked for a ligature. Two speakers, one of them with a chimney on the crook. All tone-holes covered with plates. Wide brass sleeve on lower section. Device for a music card holder. Sling ring. 14keys, 7plates, 2rings. L0: Plate; speaker 1-2. L1: Plate; throat A♮; throat A♭. L2: Plate. L3: Plate; cross E♭₄/B♭₅. L4: C♯₄/G♯₅; E₃/B♮₄; F♯₃/C♯₅. R1: Plate; side E♭₄/B♭₅; side F₄/C₆; side trill key for throat A-B♮ and B♭-C. R2: Plate + spectacle. R3: Plate + 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.