What exactly is an original (authentic) movie poster?
Typically, this term refers to a poster that was produced by The National Screen Service (NSS) (which closed shop in 2000), one of the movie studios, or by a third company authorized by the movie studio. The posters are for promotional use and/or to display in the theatre when the film is originally released. While a lot of original movie posters will have a NSS number on the bottom somewhere, not all of them do. Also note that sometimes reprint posters include this information to make their reprint look more authentic. If you’re unsure or what more info, give me a call or email.