USPS is commemorating the 1963 March on Washington with a limited-edition Forever stamp on the 50th anniversary of the historic event.

On Aug. 28, 1963, nearly a quarter of a million people came together in Washington, DC, to participate in the March on Washington for Jobs and Freedom. Dr. Martin Luther King, Jr. delivered his “I Have a Dream” speech on the steps of the Lincoln Memorial, a defining moment of the American Civil Rights Movement.

“It’s an honor to be here and dedicate a stamp that commemorates what Dr. King described as the greatest demonstration for freedom in the history of our nation,” said DPMG Ron Stroman, in prepared remarks. “The Postal Service takes pride in being able to recognize historic events by issuing these limited-edition stamps commemorating the ‘Best of America.’”

The 1963 March on Washington stamp is the last of three Forever stamps issued this year as part of a civil rights set commemorating courage, strength and equality in America. The first stamp marked the 150th anniversary of the Emancipation Proclamation in January. The second honors Rosa Parks.

The 1963 March on Washington Forever stamps will be available beginning Aug. 23 at usps.com/stamps, by calling 800-STAMP-24 (800-782-6724) and at Post Offices nationwide.