Hedge, the two guys on the podium were shooting osage selfbows backed with western diamondbacks, no bamboo. The bamboo backed bow is mine, I may have shot it the classic years ago but not The IBO. I haven't been to Twin Oaks since my wife died, its just not the same.
Here is another twin to their bows, I made it for Gil in 2011, it broke after 5 years of heavy use, he now has another one just like it but the new one doesn't shoot as good as the old one for him, different handle, it doesn't fit him quite as well as the first one.