This stamp is an example of the intricate engraving practiced at the time. The portrait used as the basis for this stamp design is taken from  pastel by J.S. Duplessis in a book titled, The Pictorial Life of  Benjamin Franklin, Printer.
The first postmaster general of the United States appeared on the  first stamp issued by the country.  Benjamin Franklin's career, however,  was much more than overseeing the movement of mail in the fledgling  nation. At the age of 17, he moved to Philadelphia, where he utilized  his experience as a printer's apprentice and found work as a printer. A  year later, he went to England, where he became a master printer.
Back in Philadelphia in 1726, at age 20, he owned his own newspaper  and later began to print Poor Richard's Almanack. His business prospered  to the point where he was able to retire at age 42.  In 1727 he  organized a group of tradesmen as the Junto. The group then founded a  library, a fire company, a college (which became the University of  Pennsylvania), an insurance company, and a hospital.  In 1740 Franklin  invented the Pennsylvania fireplace, which later became known as the  Franklin stove.
It was at this time that he did his experiments with electricity,  including the fabled kite-fly during a thunderstorm. As a result of the  experiments, he invented lightning rods, which quickly appeared on  buildings in America and Europe.  Elected to the Pennsylvania Assembly  in 1751, he began a 40-year stint as a public servant. Ever so slowly  Franklin changed his view from that of not wanting separation of America  from English control to the need for independence.  From April 1775 to  October 1776 he served on the Pennsylvania Committee of Safety and in  the Continental Congress. He also submitted articles of confederation  for the united colonies, proposed a new constitution for Pennsylvania,  and helped draft the Declaration of Independence.
He was 70 years old when he signed the Declaration.  In October 1776  he sailed for France to seek French aid for the Revolutionary War. After  signing, with the other two American commissioners, the French  alliance, Franklin became the first American minister to France.  For  seven years, then, he acted as diplomat, purchasing agent, recruiting  officer, loan negotiator, admiralty court, and intelligence ... and all  of this for a man over the age of 70 at that time in history!  Franklin  made secret contact with peace negotiators from England after the  British loss at Yorktown. He proposed treaty articles near to what  finally was agreed upon.
Together with John Jay, Franklin represented the United States in  signing the Treaty of Paris on September 3, 1783.  He returned to  America in 1785. Though 80 years old and in declining health, he still  accepted election for three years as president of Pennsylvania. At the  Constitution Convention of 1787, although too weak to stand, his gift  for compromise helped prevent bitter disputes among delegates.   Franklin's final public pronouncements advocated the ratification of the  Constitution. He died in 1790. Philatelic Information