Conn, double belled, B flat euphonium, 4 piston, 1910 Tag #: 00309 Serial #: 115804 Bell Diameter Bore Size Height 10 3/4″ .563″ 27 1/4″ Comments: “MADE BY / C.G. CONN Ltd. / U.S.O.M.C (?)” on bell. Floral engraving around identification marks. Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Like Loading...