My two cents...When Ron was working on the book he asked me and I told him at that time there were what I believed to be two genuine examples of Addie Joss signature. There is some variation in both.
The one example he used in the book. The other example which was obtained from Joss widow he did not as he was not confident enough in it to use it , so he didn't.
Since then a postcard written by Addie and addressed to his son surfaced (I think its mentioned in this thread) and it matches exactly The example I have that originated from the wife which was not in the book. I believe all three are genuine. Two are in private collections and I have no idea where the other one ended up as I never saw the original only a copy.
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jim@stinsonsports.com