Conn 26H Ball-room Model
Date: 1928. Owned by Gary Sloane
The 26H has the tuning slide in the bell and has a #3 bore (0.500") and a 7½" bell. I am told it is entirely rose/red brass (which isn't the same as Coprion). The 26H was built between 1928 and 1948. In spite of that they are very rare these days.