CSA 7-R, 5¢ blue block of four with pre-use creases and small faults, manuscript cancels, paying 20¢ of 40¢ Trans-Mississippi Express rate with manuscript "Due 20" on eastbound cover to "Col. W. B. Whitehead, Mossingford, Charlotte County, By the way of Shrievesport (sic), Va." The use of the Richmond print from west of the Mississippi points to an 1863 mailing. VERY RARE FRANKING FOR THE 40¢ TRANS-MISSISSIPPI EXPRESS RATE, COMBINING A BLOCK OF THE 5¢ RICHMOND PRINT WITH A "DUE 20" MARKING. Unlisted in Krieger. Ex MacBride (expertized in 1948) and Walske with 1997 Brian Green certificate. $2,500.