Conn, New Invention Professional, EE flat tuba, 4 piston, 1912 Tag #: 05661 Serial #: 127998 Bell Diameter Bore Size Height 17 1/2″ .689″ 35 1/2″ Comments: “MADE BY / C.G. CONN / ELKHART / IND.” on bell. Floral engraving around identification marks. Share this:TwitterFacebookLike Loading...