C. late-1980's-era 8&1/2 x 11" ORIGINAL mixed-media (paint pen/art marker) full-color drawing on thin artist's vellum paper featuring a quasi-Grateful Dead-themed design centered around a skeleton presenting a book to a rose-bedecked maiden. 

 Art by the inimitable Rick Griffin, this piece is in REALLY nice shape- there is a bit of tightening and a few tiny thin stress bends here and there, but overall this piece looks nothing short of SPECTACULAR. 

 It's not known if this was supposed to be for some sort of proposal, or if it was just a one-off, but either way it is an ABSOLUTELY GORGEOUS unpublished late-'80's Rick Griffin original! The image speaks for itself on this one.