Date: 1926, Owner unknown

The BBb Sousaphone Grand was available in 6 versions: the three valved 38K Low Pitch, three valve 39K High Pitch, four valve 40K Low Pitch (see seperate listing), four valve 41K High Pitch, the three valve 46K "Jumbo" (Low Pitch) and the four valve 48K "Jumbo" (Low Pitch). The 38K was in production from 1919 to at least 1931. The other five were probably discontinued after 1929.

What Conn said in 1926:
The New Wonder Model Sousaphone Grand Basses are the largest members of the Sousaphone family. Built in BBb, with either three of four valves, they add a deep and sonorous voice to any ensemble in which the may be used. The splendid impression made by these instruments in point of appearance is a matter of remark everywhere.
Due to the hydraulic expansion process of manufacture, these instruments are perfectly proporioned, and accurate intonation is therefore invariably obtained. The inside of the tubing is smooth as glass, having been "ironed out" by pressure of 10,000 pounds or more, and as a result the softest pianissimo passages, ecountering little resistance, can be played with great effect. This is proof of the easy blowing quality of the Conn Sousaphone Grand Bass.
The adjustable bell has a two-fold advantage. It permits saving of space in packing, with corresponding decrease in liability to damage and also permits the tone of the instrument to be thrown in any desired direction.