I have no idea, but it makes me think that it could have been another section of rod material which was used for another tip if the first one broke. Total guess of course, but it will be interesting to find out for sure. There are those boards that just deal with boo and it's history. I would post this type of question there. With a quick Google search here is one such board, which I know nothing about except that it popped up on a Google search: http://clarksclassicflyrodforum.yuku.com/