The 21st Annual Halloween Haunt button from Knott’s Scary Farm in 1993 is a rare and sought-after collectible item for fans of amusement parks and historical memorabilia. This button likely featured the iconic Halloween-themed logo or design from the event, making it a unique piece of memorabilia from the attraction. With its tie to the Halloween Haunt event at Knott’s Scary Farm, this button is a must-have for collectors looking to add a piece of amusement park history to their collection.