Bronson & Forbes' City Express Post, 1855, black on green. Margins slightly in, slightly overlapping 1857, 3¢ rose and both tied by "Chicago, Ill., Aug 25, 1857" cds on fresh corner card cover to Belvidere, Ill., Very Fine, a unique usage in combination with a 1857, 3¢ rose and one of only two known intact covers with the Bronson & Forbes' stamp tied by a postmark, ex Brown; with 2009 P.F. certificate. Scott No. 27L1+25; $14,000 with #11  Estimate $5,000 - 7,500. $0 (Image)