Clarinet with corps de rechange. Nominal pitch: B♭ / A.

Technical description: Boxwood with ivory ferrules and brass keywork. Eight pieces: mouthpiece, barrel, two upper sections for the fingers of the left hand (B♭/A), two middle sections for the fingers of the right hand (B♭/A), lower section with keys, bell. Contemporary mouthpiece grooved for cord. Levers for L4, tone-hole and key for R4 mounted in a fusiform swelling. L4 levers not extendable. Rectangular-section ivory rings between upper and middle sections. L0: T; speaker. L1: T; throat A♮. L2: T. L3: T. L4: E₃/B♮₄; F♯₃/C♯₅. R1: T. R2: T. R3: T. R4: T; G♯₃/E♭₅. Keymount type: turned wooden rings, swelling. Keyhead type: flat square, bevelled.