I forgot I had this from 2004 SDCC, you entered a contest by getting the right answer and if you were the big winner you got this poster. I can tell you the person doing it at the booth said they only had a couple dozen made for this con. 

Its 18.5 x 12.5" its on a thicker poster type paper and is frayed on the bottom. It does have slight creases about 1/3 from the bottom and 1/3 from the top, from being in the bag all day before I could put it in a poster tube. See pics, once framed you wont notice them, this was never displayed