1916-22 Rotary Press, collection of 12 coil stamps
1918 1c Washington, green
1916 2c Washington, carmine, type II
1916 2c Washington, carmine, type III
1917 3c Washington, violet, type I
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.