6th PanAfrican Prehistory Congress September 10, 2018 1967 cachet Central African Republic lithic megalith + ofdc 1967 cachet Central African Republic lithic megalith ofdc
Hei-tikis September 06, 2018 1968 1996 maxicard New Zealand ofdc + postcrossing 1968 1996 maxicard New Zealand ofdc postcrossing
Viking Heritage February 09, 2018 1973 1974 1978 aerogramme europa Isle of Man maxicard ofdc + Viking 1973 1974 1978 aerogramme europa Isle of Man maxicard ofdc Viking
Dolni Vestonice January 27, 2018 1985 2017 cachet cancel ceramic +1 Czech Republic museum ofdc postcrossing venus 1985 2017 cachet cancel ceramic Czech Republic museum ofdc postcrossing venus
Timgad November 04, 2017 1969 1977 Algeria cancel imperforate mini sheet mosaic ofdc + unesco 1969 1977 Algeria cancel imperforate mini sheet mosaic ofdc unesco
Pyramids of Giza September 29, 2017 1972 2005 2007 airmail censor +1 Egypt joint issue Nepal ofdc unesco United Nations 1972 2005 2007 airmail censor Egypt joint issue Nepal ofdc unesco United Nations
Young Olympics September 29, 2017 1968 imperforate Mexico mini sheet +0 ofdc 1968 imperforate Mexico mini sheet ofdc
International Tourist Year September 29, 2017 1967 Ethiopia ofdc +0 rock art 1967 Ethiopia ofdc rock art
Paleolithic Age April 09, 2017 2017 bone cachet cancel ivory +4 lithic mini sheet ofdc postcrossing registered rock art shell Ukraine venus 2017 bone cachet cancel ivory lithic mini sheet ofdc postcrossing registered rock art shell Ukraine venus
Avebury April 09, 2017 2017 Great Britain megalith Neolithic ofdc PHQ postcrossing + unesco 2017 Great Britain megalith Neolithic ofdc PHQ postcrossing unesco
Skara Brae April 09, 2017 2011 2017 Great Britain Neolithic ofdc PHQ unesco + UniversalMail 2011 2017 Great Britain Neolithic ofdc PHQ unesco UniversalMail