The stamps are the first of three Civil Rights stamps that will be released by the Postal Service in 2013. The other two stamps will feature Rosa Parks and the 1963 March on Washington. In 2009, the organization previously released 12 stamps featuring civil rights pioneers.
"Stamps often tap into our culture and help us remember the events and people who have had an impact on American history," said Deputy Postmaster General Ronald A. Stroman in a statement. "The Emancipation Proclamation was a powerful symbol of President Lincoln's determination to end the war, to end slavery, and to reconstruct the economy of the country without slave labor.