1851, 12¢ black, diagonal bisect, large margins except corner clipped, tied by "San Francisco Cal. 1 Aug" cds (inverted day slug) on 1853 folded letter to Boston Mass., inside endorsement of "Pr Northern", clean and Very Fine, ex-Judd; with 1973 P.F. certificate. Scott No. 17a  $2,500. A CHOICE 12¢ 1851 BISECT USE ACCEPTED AS PREPAYMENT OF THE 6¢ RATE. $0 (Image)