Conn Helicons

Conn, Clear Bore,  EE flat helicon, 3 piston, c.1879

Conn, Wonder, BB flat helicon, 3 piston, 1888

Conn, EE flat helicon, 3 piston, 1898

Conn, New Wonder, EE flat helicon, 4 piston, 1913

Conn, New Wonder, BB flat helicon, 3 piston, 1917

Conn, New Wonder, BB flat helicon, 4 piston, 1917

Conn, New Wonder, EE flat helicon, 4 piston, 1921

Conn, New Wonder, BB flat helicon, 3 piston, 1923

Conn, New Wonder, BB flat helicon, 3 piston, 1924

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