Technical description: Blackwood with silver plated german silver ferrules and keywork. Four pieces: mouthpiece, barrel, one-piece body, bell. Articulated C♯₄/G♯₅ opened by L4, closed by R1. R1 also connected to a vent key under F₃/C₅ touchpiece to improve the intonation of B₃/F♯₅. 14 keys, 2 rings, 1 plate.
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: Plate; 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.
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, reed-cap.
(5180) and (5181) in original black case with blue velvet.
Inside lid "DITTE RIUNITE / A. RAMPONE e B. CAZZANI e C / MILANO". Also in case: cork grease, cord.
Crude extension of throat A♭ key in order to conform to British fingering.
Usable pitch: low pitch.
(5180) in A and (5181) in A seem to be a matched pair of A clarinets in high and low pitch.