Original 1st printing, 14x21" concert poster for Frank Zappa, The Mothers of Invention, Boz Scaggs and Aston Gardner Dyke at The Fillmore West in San Francisco, CA, on 11/5-8/1970.
 
Art by David Singer.   
 
The poster is in excellent vintage condition.  There is a tape stain on the top corner, and toning around the edges (see photo.)