Original 1st printing 11&7/8 x 19" letterpress boxing-style concert poster for a series of shows held at the Matrix in San Francisco, CA from 10/16-27/1966.
Performers listed include: country-blues legend Lightnin' Hopkins (through 10/16), the Only Alternative and His Other Possibilities with Mimi Farina (10/18-22) and Jefferson Airplane (rehearsing their then-brand-new singer Grace Slick) and Sparrow (unlisted) from 10/24-27/1966.
Artist unknown, the alternate image for the Airplane shows (art by Tom Weller) is featured in the Art of Rock on page 164 (plate 2.112)
Medium-thin flat vellum stock is in stunning mint/near mint (A/A- to A-) condition; an overall FANTASTIC-looking early Matrix poster with a great "old-timey" look (you can actually see the indentations of the woodblock letters on the reverse). The Airplane shows were within a week of Grace Slick joining the band, read all about it HERE;