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 rusty tack holes in all four corners, along with a few thin diagonal bends in the upper left corner, a thin horizontal stress bend under "concert Sunday", a thin diagonal/vertical bend in the left margin, a tiny pull on the "l" of "Champlin", a few tiny pin-prick surface scuffs/handling/stress bends here and there, a light/subtle degree of toning and a couple of light tape pulls and a bit of flair-pen scratch on the reverse, otherwise OK.
 
 Neat-looking little oddball 1968 multi-act show poster from Los Angeles, I haven't had one of these pass through in several years.