So I have a relative who I learned was a magician, not only that he knew Houdini. All his stuff is sitting in my grandmas garage. I found a first edition copy of a book written by Houdini with a personal note to my relative from him and his wife, and a picture of him with Houdini. Apparently my relative (I think great uncle? or great grandfather) built tricks for magicians. The Houdini book was sold, and I have now come across a manuscript for the Tarbell System. Was this a common thing during the early 1920s? I have found that the manuscript was how the Tarbell system was originally released before being published. So does that mean I have something unique but not rare? Just trying to get some background on it. I don't want to handle it too much because it is old.