Technical description: Full double, stands in F, 4th valve gives B♭. Yellow brass. Windway (in F) runs: mouthpipe - m.t.s. - 4 - F side auxiliary t.s. - 1 - 2 - 3 - 4 - bell; windway (in B♭) runs: mouthpipe - m.t.s. - 4 - 3 - 2 - 1 - B♭ side auxiliary t.s. - 4 - bell. With alternative B♭ side auxiliary tuning-slide having a quick change valve for A, silver-plated.
Valve type: 4 rotary valves, the 4th valve with six ports in one plane.
Performance characteristics: Tuning a slight problem. Instrument is past its best due to deterioration of valves.
Usable pitch: Plays at A⁴ = 440 Hz.
Signature/Marks: Inscribed on bell "GEBR / ALEXANDER / MAINZ" within decorative surround; alternative auxiliary tuning-slide inscribed "B" and "A".
Specific usage history: Used professionally in London by Kenneth R. Shaw until 1965 or 1966.
P. Lewis, 1987; R. Parks, 26.01.91, 13.6.92; A. Myers (bore) 19.2.94, 10.10.09.
435 perpendicular to bell; corpus diameter 326; bell diameter 311.