The product is a vintage pinback from the 26th Annual Williams Grove Steam Engine Exhibition that took place in Mechanicsburg, PA during the years 1984-1985. This pin showcases a piece of history from a renowned steam engine event in the United States and is a great addition to any collection of pinbacks or memorabilia from the era. Its authenticity and connection to a significant event make it a valuable and sought-after item for collectors interested in vintage memorabilia.