Conn 6B Triumphal or Herald Trumpet
Date: 1924, Owned by Fred Cirksena
The 6B Herald has a #1½ Bore (0.458") and was produced from at least 1919 (but possibly earlier) to 1932.
What Conn said in 1926:
The Triumphal or Herald Trumpet is most effective in vaudeville and fanfare opera, and in pitch it is the same as the regular Bb Trumpet.