Up for sale is a stamp pin based upon the 1978 USPS stamp that depicts Harriett Tubman and a Cart Carrying Slaves as part of the Black Heritage series. The inscription on the back reads: McDonald's Limited Edition African American Heritage Stamp Pin Series Pin 2 of 4: produced under license by Winco International Chatsworth , CA. This pin is metal and measures approximately 1 1/8 X 3/4 inches. The original 13-cent stamps were Scott #1744. This item makes a great lapel pin, hat pin or tie tac.