1966 5 cent stamp with Washington D.C. skyline and 'DISCOVER AMERICA' text A vintage 1966 5¢ SIPEX Souvenir Sheet (Scott #1311 ) issued for the Sixth International Philatelic Exhibition in Washington, D.C. It features a 5-cent U.S. postage stamp alongside artwork of the U.S. Capitol and Washington Monument with the signature facsimile of Postmaster General Laurence F. O'Brien Mint #philately #washingtondc