The Emancipation Proclamation stamp designed by Georg Olden was issued on August 16, 1963.
Georg Olden
Georg Olden became the first African American to design a U.S. postage stamp in 1963, when the Emancipation Proclamation stamp was issued.
Post Office
In 1963, the The Post Office was the leading employer of African Americans in the United States.
Sources
Celebrating the Emancipation Proclamation: Postal Museum
George Olden: Blackpast