The 1928 Denver Mint issue of the United States one-cent coin, commonly known as the penny, is part of the Lincoln cent series. Collectors often seek this coin due to its historical significance and the relatively low mintage of the 1928-D variety. The coin features the iconic portrait of Abraham Lincoln on the obverse and the Lincoln Memorial on the reverse. When purchasing or selling such coins, condition, grading, and market demand play essential roles in determining their value, especially when found in a roll or as part of a larger collection.