Hercules Powder, multicolor all over illustrated "Infallible" Powder design on 1920 cover showing Ducks Landing in a Marsh, franked with 2¢ Washington-Franklin tied by Mystic, Conn. machine cancel, small Trademark Herculean Figure with Club on flap, Extremely Fine, a choice example of this rare design. Estimate  $500 - 750. $0 (Image)