Technical description: Cocus wood with german silver ferrules. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Two rollers at L4, end-pivoted F₃/C₅ key. Elegant keywork. Curved speaker, chimney on the front of the instrument. Leaf springs. 14 keys, 2 rings.
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: T; side F₄/C₆; side E♭₄/B♭₅; side trill key for throat A-B♮ and B♭-C.
R2: T + ring.
R3: T + ring; cross B♭₃/F♮₅.
R4: F₃/C₅; G♯₃/E♭₅.
Keymount type: screwed in pillars, Keyhead type: modern
Condition: Mouthpiece missing.
Repair History: Barrel a replacement.
Inscribed on silver plate "BERTELING / NEW YORK".