Original 1st printing 8&1/2 x 11" concert flyer for Notes from the Underground appearing at the Matrix in San Francisco, CA from 6/2-4/1967. 

 

 Art by Jack Downing, thin flat stock flyer is in SPARKLING mint/near mint to near mint (A/A- to A-) condition; aside from a couple of VERY soft handling dings and a tiny corner bump or two, it is an unbeatable example of this oddball mid-'67 concert flyer from the legendary Matrix.