1923 Germany
1918 Russia
1944 Italian Social Republic
1948 Uruguay
1949 Pakistan Bahawalpur
1950 Spanish West Africa
1947 Swaziland
1941-44 Germany
1924 Greece
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.