Confederacy, Salisbury Prison, Salisbury, N.C., "Prisoner of war letter" endorsed homemade cover to Philadelphia Pa. bearing 5¢ blue (4), 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; reduced slightly at left with minor corner flaw, fresh and Very Fine; with 2009 C.S.A. certificate. Scott No. 4 + U.S. 65  Estimate $2,000 - 3,000. A RARE COMBINATION USAGE FROM THIS CONFEDERATE PRISON. $0 (Image)