Original 1st printing 11&1/2 x 17&1/2" concert poster for a "Twelve-Hour Show" (Labor Day weekend dance concert), featuring Quicksilver Messenger Service appearing with Steppenwolf, Black Pearl, Buddy Miles Express, Sons of Champlin, H.P. Lovecraft, Three Dog Night, West and Fraternity of Man at the Sports Arena in Los Angeles, CA on 9/1/1968.
 
 Designer unknown/uncredited, medium-thick flat index stock poster is in good (B) condition; there are several semi-pronounced vertical/horizontal creases/folds (8 total- poster was folded into 1/14ths by show attendee, seven times horizontally, once vertically), along with a slight stain in the lower left margin, a few tiny pin-prick spots and dings here and there, a touch of light surface dirt and a bit of creasing in the corner tips, otherwise OK.
 
Cool-looking little oddball late-1968 multi-act show poster from Southern California. Interesting lineup on this one!