1977 Airmail – The 50th Anniversary of The Central Bank of Ecuador – Gold Mask
1977 Airmail – The 50th Anniversary of The Central Bank of Ecuador – Gold Mask
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1977 The 50th Anniversary of The Central Bank of Ecuador – Fluorescent Paper
1977 The 50th Anniversary of The Central Bank of Ecuador – Fluorescent Paper
1977 Airmail – The 11th General Assembly of Technical Committees of the Pan-American Historical and Geographical Institute
1977 Airmail – The 11th General Assembly of Technical Committees of the Pan-American Historical and Geographical Institute
1977 Airmail – The 11th General Assembly of Technical Committees of the Pan-American Historical and Geographical Institute
1977 Airmail – The 11th General Assembly of Technical Committees of the Pan-American Historical and Geographical Institute
1977 The 11th General Assembly of Technical Committees of the Pan-American Historical and Geographical Institute
1977 The 11th General Assembly of Technical Committees of the Pan-American Historical and Geographical Institute
1977 Airmail – The 260th Anniversary of the Birth of Sister Catalina de Jesus Herrera, Religious Author, 1717-1795
1977 Airmail – The 260th Anniversary of the Birth of Sister Catalina de Jesus Herrera, Religious Author, 1717-1795
1976 Airmail – President Luis Cordero Commemoration, 1833-1912
1976 Airmail – President Luis Cordero Commemoration, 1833-1912
1976 Airmail – Mariuxi Febres Cordero, South American Swimming Champion
1976 Airmail – Mariuxi Febres Cordero, South American Swimming Champion
1976 Airmail – Meeting of Agricultural Ministers of Andean Countries, Quito
1976 Airmail – Meeting of Agricultural Ministers of Andean Countries, Quito
1976 Airmail – Meeting of Agricultural Ministers of Andean Countries, Quito – Fluorescent Paper
1976 Airmail – Meeting of Agricultural Ministers of Andean Countries, Quito – Fluorescent Paper