The Burbank trumpet company was a continuation of the Benge trumpet company after Benge was absorbed by UMI and moved to Ohio. The Burbank name is an homage to an era of Benge trumpets where Elden Benge was still presiding over manufacture. These trumpets were produced with the help of Kanstul, and are almost 1:1 copies of vintage Benge trumpets. The Burbank 5S features the #5 bell, which is a more symphonic design than the standard #3 bell, I saw a thread that said only 12 of these were made, not certain though