Technical description: Blackwood with silver plated german silver ferrules and keywork. Five pieces: mouthpiece, barrel, upper section, lower section, bell. Throat A key corresponding with two vents of speaker key: the upper stands open, the lower closed when only speaker key is depressed. If throat A is also depressed the upper vents closes and the lower stands open in order to give a proper throat B♭. Forked E♭₄/B♭₅. Additional G♯₃/E♭₅ lever. Vent key in bell through tenon of lower section. All tenons and sockets lined with german silver. 18 keys, 7 rings, 2 black rollers.
L0: T + ring F₄/C♮₆; speaker.
L1: T + ring F♯₄; throat A♮; throat A♭.
L2: T + E♭₄/B♭₅ corresponding ring.
L3: T + ring; cross E♭₄/B♭₅.
L4: C♯₄/G♯₅; F₃/C♮₅; E₃/B♮₄; F♯₃/C♯₅; G♯₃/E♭₅.
R1: T + ring B♭₃/F♮₅ via correspondence; side E♭₄/B♭₅; side F♯₄/C♯₆; trills 1-2.
R2: T + ring B♮₃/F♯₅ via correspondence.
R3: T + ring B♮₃/F♯₅ via correspondence; cross B♮₃/F♯₅.
R4: G♯₃/E♭₅; E₃/B♮₄; F₃/C♮₅; F♯₃/C♯₅.
Keymount type: screwed in pillars.
Keyhead type: modern.
Playing accessories: two unstamped barrels.
With case, marked "Richard Keilwerth", cleaner.