Original 1st printing 12&3/4 x 18&1/4" concert poster for S.F. psych-folk band the Wildflower appearing at the Matrix in San Francisco, CA, from 10/28-30/1966.
Art by Tom Weller, image is featured in the Art of Rock book on page 167 (plate 2.125).
Medium-thick flat index stock poster is in very good to excellent (B/B+ to B+) condition; a series of small pin-prick splatter stains in the top left corner/upper left margin, along with a few ultra-thin diagonal bends in the upper left corner and a few razor-thin vertical bends going down the left margin and a tiny edge ding or two, otherwise fine.
An overall VERY nice-looking example of this scarce early (1966) 1st printing Matrix poster from the Art of Rock.