(Cameo) W.W. Wallace, Manufacturer by Steam Power, large blue ornate illustrated cameo corner card with Calvert imprint showing Steam Engine and Mill Stone, on fresh cover franked with 1851, 3¢ dull red tied by "Pittsburgh, Pa., Jul 14" cds, Very Fine and choice, a gorgeous cameo. Scott No. 11A  Estimate $200 - 300. $0 (Image)