Confederacy, Confederate States of America/War Department/Nitre and Mining Bureau. Semi-official imprint with "Official Business" crossed out on buff cover bearing 1863, 10¢ blue (four margins, light corner crease), tied by "Richmond Va. Feb 18" cds, addressed to Fredericksburg Va., Very Fine and scarce. Scott No. 11. Estimate  $300 - 400. $0 (Image)