Buescher, Jumbo, BB flat sousaphone, 3 piston, 1926 Tag #: 02308 Serial #: 218546 Bell Diameter Bore Size 30″ .770″ Comments: “THE / BUESCHER / ELKHART / IND / USA” on small end of bell. Floral engraving around identification marks. Share this:TwitterFacebookLike this:Like Loading...