The postage stamp edition evokes, precisely, the past, present and future of Imprensa Nacional (Official Printing Office). The two stamps shown include, in their historical component, a photographic record of the library of the Official Printing Office, built in 1923, which currently holds a bibliographic collection of around 20 thousand volumes. The second stamp, referring to the present-day of the Official Printing Office, evokes a contemporary and modernised editorial mission responding to current challenges and its responsibility in the context of promoting the Portuguese language and culture.