Original Second Printing , 14&1/8 x 20" concert poster for Junior Wells and His Chicago Blues Band, and Steve Mann at The Matrix in San Francisco, CA, on 12/27-1/8/1966-67.
 
Art by Victor Moscoso.  Image is #1 in the Neon Rose series.   
The poster is in good vintage condition.  There are tackholes on all four corners, light edgewear, and roll creases throughout.