1851, 12¢ black, diagonal bisect. Upper right half tied by "San Francisco, Cal., Sep 1" cds on cover front to New York, straight line "Due 10" with manuscript "20" due re-rate, Fine, a very scarce bisect usage, ex Matthies. Scott No. 17a  Estimate $600 - 800. $0 (Image)

1851, 12¢ black, diagonal bisect. Bisecting lower left and upper right of stamp, tied by "San Francisco, Cal., Aug 16" cds on cover to Boston, second strike of postmark over blue corner card handstamp for mathematical & nautical instrument maker, cover restored with added backflap and slightly reduced at top, F.-V.F., ex Chase; with 1988 P.F. certificate. Scott No. 17a  Estimate $500 - 750. $0 (Image)