Collectible coins, particularly those from the United States, can vary in type, denomination, and mint mark. The 5-cent nickel, commonly referred to as a nickel, has been produced in various designs since its introduction in 1866. The 1978 nickel, minted in Denver (denoted by a "D" mint mark), is part of the Jefferson series, which features the profile of President Thomas Jefferson on the obverse and Monticello on the reverse. Rolls of 1978 nickels can be of interest to collectors due to their historical significance and the presence of specific mint marks which can affect value.