I've paused my dvd of Derek & Susan's performances on the Crossroads dvds numerous times trying to see if I can make out some of the signatures on their guitars but always come up empty. I've searched the internet and can't find any info either. Judging by Derek's obvious and justly deserved elation during "Highway 61 Revisited" with Johnny Winter I would assume that Johnny's signature is on there somewhere.
Any info would cure a knawing curiosity.

Thanks!