(Experimental Perforations) 3¢ Brownish Carmine, Type I, Unofficial "Chicago" Perf 12½, centered to right with portion of adjoining stamp at left, perforations all around, tied by "Chicago Ill. Sep., 1856" cds's on cover to Evansville Ill.; stamp with trivial toned perfs at top left, F.-V.F., a fresh cover with the rare 3¢ Chicago Perforation; with 1970 and 2010 P.F. certificates. Scott No. 11; $8,000  Estimate $2,000 - 3,000. Wilson Hulme recorded 40 examples used on cover and 30 used off-cover in his 1997 census in Chronicle 175. Since that time a small number of additional examples have been discovered. $0 (Image)