(Flour) The Great White River Flour & Grocery House. Gorgeous all over multicolor advertising (front & back) on 1885 cover showing "The Great White River Flour & Grocery House" franked with 2¢ Bank Note tied by Pittsburgh, Pa. duplex cancel, minor cover reduction at right, Extremely Fine, one of the most stunning advertising cover of the era. Estimate  $200 - 300. $0 (Image)