1961 Paraguay
1960 Paraguay
1962 Paraguay
1963-64 Pakistan
1957 Saar
1963-64 Samoa
1958 Saar
1962 Sierra Leone
1961-78 Pakistan
1963 Paraguay
1992 Russia
1961 Pakistan
1977 Maldive Islands
First commemorative stamps of the 20th century.
Columbus stamp promoted the 1893 Chicago World Columbian Exposition.
A single stamp to cover the one-pound air parcel rate in 1952.