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Continue to ChatUnited Nations New York 1992 Earth Summit (SG 615-618, CTO) https://www.grahamlandstamps.co.uk/shop/stamps/stamps-by-country/united-nations/united-nations-new-york-1992-earth-summit-sg-615-618-cto/
United Nations New York 1992 Earth Summit (SG 615-618, CTO) https://www.grahamlandstamps.co.uk/shop/stamps/stamps-by-country/united-nations/united-nations-new-york-1992-earth-summit-sg-615-618-cto/