|Photo courtesy of Paul Bierley, The Incredible Band of John Philip Sousa, p. 46|
First, the bell appears larger, and seems to sit higher above the head of the player.
Second, and much more obvious, the tubing that comes from the third valve is entirely different, as it now forms a long, straight line that sits below the fourth valve, and culminates in a small, double-wrap on the right before connecting once again with that third valve.
|Photo courtesy of Paul Bierley, The Incredible Band of John Philip Sousa, p. 55|
|Photo courtesy of Ian Church|
|Photo courtesy of the Sousa Archives|