The Clark Bar was introduced in 1917 by David L. Clark and was popular during and after both World Wars. It was manufactured in Pittsburgh, Pennsylvania, by the original family-owned business until 1955. It was then manufactured by corporate owners until a series of sales and bankruptcies in the 1990s resulted in transfer of production to the Revere, Massachusetts–based New England Confectionery Company (Necco). Following Necco's 2018 bankruptcy, the Clark Bar is now produced in western Pennsylvania, by the Altoona-based Boyer Candy Company. The Clark Bar is a candy bar consisting of a crispy peanut butter/spun taffy core (originally with a caramel center) and coated in milk chocolate.