well, I'd be down for the 10th, let me know. (I hope I didn't break any rules by posting this comment)
I would say that if that 90th is in good condition (no scratches, nicks, etc), I would say you could get about $1500. Personally, I believe that without the cert, the guitar loses a lot of its value since it was a collector's item. However, I could be wrong (and I hope I am for your pocket's well being

)
I would pm Rich and ask him since he's the foremost expert on this.
Let me know about the 10th.
Jimmy
P.S.: Post some pics of the 90th, I'd love to see it (I've always loved that paint job).