I would have to dig through my collection to find the one he signed for me, but honestly, I would lean more towards it being legit. Stan was a great guy and he signed anything and everything for anyone who asked. To give you an idea, at the event I went to (I'm gonna say around-ish 2001... I think though I might have to stretch my brain to really remember exactly) he gave a talk at a very well attended library function where he was a keynote speaker and then went next door to the library and stuck around signing all manner of everything for the next FIVE HOURS until everyone who wanted his signature had gotten it. He didn't have to do that. He honestly appreciated his fan base and made a point of making sure to show it. If I had to guess, his signature is legit more often than not merely based on the sheer number of things he signed over his lifetime. I'll still see if I can dig up the book with his sig though to post a comparison.