b'Here is a breakdown: 30x40 - the NSS number was initially on the bottom right like the one sheet but by the mid 1940s it had changed to being in the middle on the left and right borders. 40x60 - the NSS number is on the bottom right border just like the one sheet, but it is also unside down on the top left border. Half Sheet - the NSS number was on the bottom right corner until 1968 when it changed to being on the top left and right borders. Insert Poster - the NSS number was on the bottom right corner until 1977 when it changed to being on the bottom left and right border \'side ways\'. Lobby Cards - on the bottom right corner In order to indicate a poster is a reissue/rerelease, all NSS numbers contain the letter "R" preceding the number code. Any NSS number containing an "R" in the first position indicates that the poster was reissued/rereleased in the year indicated. NOTICE: the sample below shows the one sheet for the 1975 reissue for A Touch of Class. NATIONAL SCREEN SERVICE TAG In addition to the NSS number, the National Screen Service also included a tag across the bottom of the poster. Although the language varied somewhat through the years, the following is one example of the NSS tag used from the mid-1950\'s to mid-1960\'s:Property of National Screen Service Corporation - Licensed for use only in connection with the exhibition of this picture at the theatre licensing this material. Licensee agrees not to trade, sell or give it away, or permit others to use it, nor shall licensee be entitled to any credit upon return of this material. This material either must be returned or destroyed immediately after use.'