1957. PARAGUAY UN. 90 c. overprinted N. UNIDAS DIA 24 Octubre 1945 - 1956. + pair 30 C. on cover with UN logo and the text SEMANA DE NACIONES UNIDAS 24 al 31 X 57 ASUNCION. 1957. The coat of arms drawing 90 C. lilac blue w. red overprint "DIA N.UNIDAS 24 OCTUBRE 1945 - 1956" were officially not issued. Very interesting piece of United Nations history.