1851, 12¢ gray black, used with 1¢ blue, type IV (9) horizontal pair and two 3¢ dull red (11) singles, all tied by three strikes of "San Francisco Cal. Aug. 5" cds on blue 1856 folded cover to Philadelphia Pa.; vertical file fold affects left 1¢ and 12¢ stamps, some slight edge wear, Fine, An attractive usage combining all three denominations issued in 1851. Scott Nos. 17  Estimate $750 - 1,000. $0 (Image)

1851, 12¢ gray black, blue town cancel, clear to large margins, deep color and sharp impression, Very Fine; with 2001 P.F. certificate for pair. Scott No. 17  $265. $0 (Image)

1851, 12¢ gray black, horizontal pair, light town cancel, ample to huge margins, sharp detailed impression, Extremely Fine, a choice lightly canceled pair; with 2014 P.S.E. Graded certificate (XF 90). Scott No. 17  $575. $0 (Image)

1851, 12¢ gray black, pair, black and red integral rate town cancels, margins mostly large to just into outer frameline at upper left, intense color, Very Fine, an attractive pair. Scott No. 17  $575. $0 (Image)

1851, 12¢ gray black, horizontal pair, light black grids and potion of red transit cancels, ample to large margins, strong color and crisp impression, P.F. cert. mentions faint tone spots which are virtually indiscernible, Very Fine and choice; with clear 2003 P.S.E. and 2011 P.F. certificates. Scott No. 17  $575. $0 (Image)

1851, 12¢ gray black, left margin horizontal pair, grid and small portion of red transit cancels, sharp impression, left stamp with small internal wrinkle, Very Fine. Scott No. 17  $600. $0 (Image)

1851, 12¢ gray black, horizontal strip of 3 and four singles, tied on piece by New York town cancels, small stamp flaws, F.-V.F. appearance. Scott No. 17  $1,825 for pair and singles. $0 (Image)