The product is a 1957-D Mint Error Lincoln Wheat Cent Penny with the letters 'BIE' in the word LIBERTY. This copper coin was struck as a business strike in Denver and is part of the Lincoln Wheat Penny series. It is classified as a circulated coin and has not been certified for its authenticity. The error variety adds to the uniqueness of this United States coin, making it a desirable collectible for numismatists interested in mint errors.