1948, 3¢ George Washington Carver. Tied by "Tuskegee Institute Ala. Jan. 5, 1948" cancel on Dorothy Knapp multicolored cacheted First Day cover, label at bottom reads "Research in Chemurgy", fresh and Very Fine, a scarce Knapp cachet. Scott No. 953  Estimate $750 - 1,000. $0 (Image)