Original 1st printing 8&1/2 x 14" large concert flyer for Nick Gravenites (Electric Flag) appearing with Congress of Wonders at the Matrix in San Francisco, CA from 11/8-13/1966. 
 
 Art by Ruth Garbell, thin flat stock flyer is in excellent (B+) condition; just a trace of light smudging/dirt and a bit of light creasing along the top margin (part of it looks like a sneaker tread), along with a few well-hidden soft handling dings here and there and a bit of light inking in the bottom center of the image area, otherwise fine.

 Cool-looking oddball late-'66 Matrix flyer featuring a pre-Electric Flag Nick Gravenites.