Up for sale is a stamp pin based upon the 1991 stamp honoring Carter G. Woodson holding a History Book. The stamp was part of the Black Heritage issue. . The pin is enamel on etched metal (cloisonne). The 20-cent stamp upon which the pin is based is Scott #2573. It measures approximately 1 X 1.5 inches. This item makes a great lapel pin, hat pin or tie tac.