This is a Carnival Poster.  It is smaller than a standard poster and is 17" x 23"  Carnival posters were given out as prizes for winning carnival games back in the 1970s and 1980s.  The quality of the print is not as nice or detailed as a regular poster, sometimes there are printing marks on the edges and the image may not be perfectly centered.  In addition, while they are new old stock with no pinholes or major damage, these have been stored for a few decades so there may be some edge wear.  Make sure you look closely at the images before bidding.