The Sousa grade was the highest grade of Flues SBT, costing $750 when the 7e was $310.
Sousa grade guns have a Mermaid in gold on the trigger guard, and very different gold inlays on the side panels.
Interesting that the 7e checkering pattern is more complicated and more attractive to my eye, than the Sousa.
The best reference to Ithaca SBT guns, other than Walt Snyder, is a well illustrated article in Double Gun and Single Shot Journal, Volume 23, Issue 4, Winter 2012.
- Ithaca Single Barrel Trap Guns by Townsend Breeden.