Original 1st printing 14&1/4 x 19&7/8" concert poster for Captain Beefheart,& his Magic Band and the Charlatans, at the Avalon Ballroom in San Francisco, Ca, on 8/26-27/1966.
 
Art by Stanley Mouse.  Image is #23 in the FD Family Dog series.  
 
The poster is in vintage condition.  There are tackholes on all four corners a tiny rip near the top some light edgewear, and a few oil stains that seeped into the paper.   See photo.  The condition definitely reflects a poster that was put up.