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/decent (B/B-) condition; there are pronounced vertical/horizontal creases/folds (poster was folded into 1/4ths by show attendee), along with tack holes in the upper left/right corners, a few semi-soft surface smudges, pin-prick spots and tiny stress creases scattered throughout the image area, a bit of edge/corner creasing, a thin bend/crease along the lower right margin and a touch of toning, otherwise OK.
 
 Neat-looking little oddball 1968 multi-act show poster from Southern California. Pretty wild lineup on this one!