ROPER HOSPITAL, CHARLESTON, S.C., UNION 600: adversity prisoner-of-war cover, made from a printed doctor's bill, postmarked PORT ROYAL S.C. SEP 5, 1864 double-circle and Due 3 straightline, manuscript Via Flag of Truce and Exd. H.H.R. (Confederate censor Lt. Hugh H. Rogers); written by John W. Austin, 5th Iowa Inf., a prisoner at Roper Hospital, ONLY 28 KNOWN. Pictured in Galen Harrison's book, Prisoners Mail From The American Civil War, on page 49, Ex Harrison. ONE OF THE UNION 600 HELD UNDER FIRE OF THEIR OWN GUNS. $1,700.