Bass clarinet. Nominal pitch: B♭.

Technical description: Brown wood with german silver crook, ferrules, and keywork. Five pieces: mouthpiece, crook, upper section, lower section, bell. Wooden Albert mouthpiece marked for a ligature. Raised L1 and L2tone-holes. Straight speaker, short throat A♭ key. Wide metal ring as thumb rest has been moved. Sling ring mount has not enough space. 12keys, 1, ring, 4tone-holes covered. L0: T; speaker. L1: T; throat A♮; throat A♭. L2: T. L3: Covered tone-hole; cross E♭₄/B♭₅. L4: C♯₄/G♯₅; E₃/B♮₄; F♯₃/C♯₅. R1: Covered tone-hole; side F₄/ C₆; side trill key for throat A-B♮ and B♭-C. R2: T + ring. R3: Covered tone-hole (forked B♭₃/F♮₅); cross B♭₃/F♮₅. R4: G♯₃/E♭₅; F₃/C₅. Keymount type: screwed in pillars with push pins. Keyhead type: modern. Repair History: The mouthpiece is a replacement. The original inscription "I.T.Uhlmann / Wien" has been covered by a wide metal sleeve.