CSA 11c, 10¢ greenish blue (4 large balanced margins) tied bold beautifully struck blue GREENSBOROUGH / N.C. // DEC / 10 cds on semi-official imprint cover of Chief Enrolling Office, 6th Congressional District, Greensborough, N.C. (CSA Catalog type WD-CN-15 with CV of $500.), with “Official” at upper left, to J. W. Hunter, Salem, N.C. Top back flap missing, a lovely and scarce use. $550.