Original 1st printing 17 x 22" concert poster for NYC-based blues/folk/rock band the Blues Project appearing with Robbie Basho at the Matrix in San Francisco, CA from 8/30-9/8/1966. *no show on 9/6

 Artist unknown/not credited, medium-thick vellum stock poster is in very good (B/B+) condition; there is a thin horizontal bend traversing the middle of the image area, along with a soft drip stain along the bottom right margin, a set of tiny staple holes (all four corners), a bit of light creasing/wear  around the outer margin area (a bit more prominent in the upper left margin), a few soft handling/stress creases here and there and a strange inking anomaly along the left side of "Project", otherwise fine.

 Great-looking original late-'66 Matrix poster, and not an easy one to come by... this is maybe only the second or third example that I have seen.