LIBBY PRISON, RICHMOND, VIRGINIA: pristine outgoing prisoner of war cover bearing US 65, cork canceled with OLD POINT COMFORT / VA // MAY / 10 dcds on cover to Capt. Ezra Clarke, Middleton, Conn. with manuscript directive at top U.S. Prisoner of War From Libby Prison, Richmond, Va., file fold across top, Southern prisons are scarcer than Union prisons. $500.