 The 3-cent was the "workhorse" for first-class domestic postage; 130 billion stamps were printed.The 3-cent rate applied to one-ounce postage for Pan American Union and Spain Treaty rate on letters addressed to South America and Spain.Thomas Jefferson is honored on the 1-cent stamp in the Prominent Americans Issue of 1965–1978, released on January 12, 1968, in Jeffersonville, Indiana.