Original 1st printing 13&3/8 x 22&1/2" concert poster for the Only Alternative & His Other Possibilities (Possibility) appearing with at the Matrix in San Francisco, CA beginning on 10/18/1966. *engagement lasted through 10/23

 Artist unknown/not credited, medium-thick flat index stock poster is in good to very good (B to B/B+) condition; there are staple holes (all four corners) with a small triangular wedge tear in the upper left corner, along with a bit of horizontal stress creasing along the top/bottom margins, a couple of small diagonal corner-tip bends, a few fairly well-camouflaged thin stress bends hiding within the image area, a couple of areas of light toning, a stray edge nip tear or two lurking around the outer margin area, a whisper of toning and a few soft surface smudges here and there (front and reverse sides), otherwise OK.

 Uncommon late-1966 Matrix poster with a charming (if a bit simple) design. The band's lineup at this time apparently included Mimi Farina, read more about them HERE:

https://formimifarinawithlove.blogspot.com/p/the-only-alternative-his-other.html