What is most likely the final S/L from Richard Matheson. You will notice the limitation page is different from the name of the book. I received the following email from Barry Hoffman at Gauntlet Press.
Richard passed away before he could "initial" the tipsheets for the book. So, we used a tipsheet from another book and as a bonus you get his full signature rather than just his initials. The number is correct. These were extra tipsheets from the other book. We numbered them 1-100 (that's the reason for the low print run for this edition). The value, if anything, is enhanced because you got a Matheson signature not just his initials like with OTHER KINGDOMS. Matheson had a severe write condition the past few years so he would only initial the numbered editions.