I don't like this one. The forgery is from a skilled hand but I don't like the hand writing. I don't think it's his. And there is something strange about the "evie" in Stevie and the huge "R" in Ray and it doesn't seem to aligned correctly in relation to the rest of the signature. I also think it is signed in a silver sharpie which didn't exist in 90 when he passed away. So for with the two anomalies in the signature and hand writing that I don't believe to be his and what I think is a silver sharpie I am saying this is unfortunately not authentic.
You bet, hope that helps. Do you own this or were you thinking about buying it? I'd be interested to see the source. If his other items are fake too that will seal the deal so to speak.