Technical description: Blackwood with nickel plated german silver ferrules and keywork. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Heckel's patent twin speaker holes and LH rings operating vents on upper section. Alternative L2/L3 levers for F₄/C₆ and E♭₄/B♭₅. Alternative touchpiece for C♯₄/G♯₅. C sharp mechanism. Alternative G♯₃/E♭₅ lever for L4. 15 keys, 5 rings, 4 black ebonite rollers.
L0: T; speaker.
L1: T + ring + vent; throat A♮; throat A♭.
L2: T + ring + vent; alternative cross key for F₄/C₆.
L3: T + ring; cross E♭₄/B♭₅.
L4: C♯₄/G♯₅; E₃/B♮₄; F♯₃/C♯₅; alternative lever for G♯₃/E♭₅.
R1: T; side F₄/C₆; side E♭₄/B♭₅; side trill for throat A-B♮ and B♭-C; alternative touchpiece for C♯₄/G♯₅.
R2: T + ring.
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.