This 5-cent stamp marking the 150th anniversary of Indiana's admission into the Union was issued on April 16, 1966, in Corydon, Indiana, the state's first capital. It is based on a commemorative seal designed by Paul Wehr of Indianapolis for the sesquicentennial observance. Indiana was the 19th state to gain admission to the Union, as symbolized by the cluster of brown stars.
This stamp was printed on the Giori press and issued in panes of fifty. The arrangement of the colors required two passes through the press, resulting in two plate numbers on each pane. An initial printing of 115 million stamps was authorized.
Postal Bulletin (March 10, 1966).