ROCK ISLAND BARRACKS, ILLINOIS: US 65, 3¢ rose bottom row straddle margin copy with pane divider line tied ROCK ISLAND ILL MAR 18 ’65 duplex on cover to Mrs. Sarah A. McCleave, Cumberland, Md; blue prisoner’s examined oval (CSA Catalog type PWH-13a, only used about six months). Very late use. Harrison shows this marking used August 11, 1864-February 21, 1865, making this perhaps the LATEST RECORDED. Ex Ralph Swap. $500.