Valuable United States Stamps - LifeStyle

insider.si.edu: Understanding the grill stamps of the United States / Jan Hofmeyr "In 1867 and 1868, the United States produced some of the most expensive postage stamps in the world - the grills. Based on a patent by Charles Steel, they were an attempt to produce stamps that could ... MSN: 13 Most Valuable Postage Stamps in the U.S.

and the World