Gregg Signed Dictionary?

I came across this signed copy of this Gregg Shorthand Dictionary on eBay by John Robert Gregg himself, or so its alleged. I thought I would post it here considering this is where some of his fan-base remains. Perhaps someone could shed some light onto its authenticity. I am not bidding on it myself. If it is spurious I wonder how many people would think to counterfeit after someone who no longer has a household name.

Here is the signed page courtesy of eBay:

And here is a picture of his signature from Wikipedia:

What do you guys think?


 Second find mentioned in my comment below

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