Uruguay 1952 Death Centenary of General Artigas 20c Coat of Arms Printer's sample with green background (issued stamp was orange-yellow) overprinted Waterlow & Sons SPECIMEN with security punch hole without gum, as SG 1018
Uruguay 1952 Death Centenary of General Artigas 20c Coat of Arms Printer's sample with green background (issued stamp was orange-yellow) overprinted Waterlow & Sons SPECIMEN with security punch hole without gum, as SG 1018