Confederacy, Salisbury Prison, Salisbury, N.C. "Prisoner of war letter" endorsed cover to Philadelphia, Pa., franked with 1862, 5¢ blue (edge flaws) in combination with U.S. 1861, 3¢ rose, both tied by "Salisbury, N.C., Jun 23" cds, 3¢ additionally tied by "Old Point Comfort, Va., Jul 12" cds, light pencil "Ex NK" examiner's marking, fresh and Very Fine, a rare combination usage from this Confederate prison. Scott No. 4+U.S. 65  Estimate $1,500 - 2,000. $0 (Image)