Original 1st printing 14 x 21&1/4" concert poster for Big Brother & the Holding Company (featuring Janis Joplin) appearing with Iron Butterfly and Booker T. & the MG's at the Fillmore Auditorium and Winterland in San Francisco, CA from 4/11-13/1968. 
 
 Art by Patrick Lofthouse, image is # 115 in the Bill Graham/Fillmore series.
 
 Medium-thick flat index stock poster is in fantastic mint/near mint (A/A- to A-) condition; just one or two extra-tiny edge/surface dings and that's pretty much IT... an absolutely GORGEOUS example of this often-underrated Fillmore poster.