Letter of authenticity for the American flag flown over the U.S. Senate Building during the official month of mourning for President Kennedy, signed by Joseph C. Duke, Sergeant at Arms, United States Senate.The letter text is printed and typed in dark blue ink. The Great Seal of the United States is impressed into the paper in the upper left corner. The text of the letter is as follows: "Joseph C. DukeSergeant at ArmsUnited States SenateDecember 23, 1963TO WHOM IT MAY CONCERNThis is to certify that this flag was flown over the Senate Wing of the United States Capitol from the seventh of November until the twenty-second of December, Nineteen Hundred and Sixty-three.Upon the assassination of President John Fitzgerald Kennedy on the twenty-second of November, this flag was lowered over the United States Senate and continued to fly at half-staff during the official thirty-day period of mourning ending the twenty-second of December."Mr. Duke's signature appears below this typed text.[See record 1998.043.0001.0003 for the flag that accompanies this letter of authenticity.]