DuPont Smokeless Powder. Multicolor illustrated design on 1903 cover showing Short Billed Dowitcher, franked with 1902 2Ā¢ (slightly faded) tied by "Delaware, Ohio" duplex cancel, multicolor advertising text on reverse, bit of flap torn away, Very Fine and choice. EstimateĀ $200 - 300. $0 (Image)