1940 Postage Stamp Centenary Centenary of the world’s first adhesive postage stamp, 6 May 1940. Great BritainArgentinaBulgariaBurma > MyanmarCubaDominican RepublicGuatemalaEl SalvadorEstoniaGuernseyLiberiaMexicoParaguayMorocco Agencies > MoroccoNicaraguaPortugalTangier > MoroccoBack to the Collections