Confederacy, Rock Island Barracks. Prisoner of war cover to Natchez, Miss., franked with U.S. 1861, 3¢ rose tied by "Rock Island, Ill Feb 24, 1864" cds and target duplex, large "Prisoner's Letter Examined" handstamp (Harrison type Ib) and prisoner's endorsement at lower left, Very Fine. Scott No. U.S. 65  Estimate $300 - 400. $0 (Image)