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Technical description: Brass; bell without gusset, with French rim. Bow guard with knob. Looped crook without tuning-slide. The crook tenon and receiver act as a tuning-slide, a ligature restraining screw holds the crook in position. With curved hand-rests to support instrument on both hands; also ring for neck strap. SATK; the open-standing bell key for A has separate springs for the touchpiece and the keyhead without attachment between the two shanks; screw adjuster to control opening of A key. With wire guard to protect F♯ and G keys. Fitting for music-card holder.; Nominal pitch: B♭.; Type or system: 11 keys.; Keyhead type: round, slightly domed.; Keymount type: pillars on plates with channels for springs.; L0: @I{C.L1: @I{A.L2: @I{B.L3: @I{C♯.R0: @I{D simultaneously controlling two keyheads covering two toneholes.R1: @I{A♭.R2: @I{G.R3: @I{F; F♯ overlapping F.R4: @I{E♭; E overlapping E♭. Usable pitch: Probably built or modified for use at circa A₄=|452.4|Hz.

  • Measurements:Overall size: 1104; bell 214.; Sounding length: 2766 (all keys closed).; Bore: crook at c|40mm from mouthpiece receiver (minimum bore) 12.95; crook at 1035 - 1096mm from mouthpiece receiver (tenon), 33.0; at 1383mm from bell end, c|43.1; at c|944mm from bell end, 60.95.B|=|0.34 (all keys closed).Dia of mouthpiece receiver: m.r.t. 13.4 - 12.95.