Autor: General Post Office of the United Kingdom of Great Britain and Ireland
Título: First world postal stamp ever issued : the Penny Black, Great Britain, 1840.
Data: 1 May 1840
Origem: https://web.archive.org/web/20031005130408/www.uno.edu/~asoble/images/pblack2.jpg
Fonte: https://commons.wikimedia.org/wiki/File:Penny_black.jpg
Licença: Domínio Público
06-05-1840