Collectible coins, such as the 2016 Denver 5-cent nickel, are often sought after by numismatists due to their historical significance, rarity, and unique designs. The 5c Roll typically contains 40 nickels, often representing a variety of mint marks and years, which can impact their value. The Denver mint is known for producing high-quality coins, and specific issues, like the 2016 nickel, may feature design variations that are attractive to collectors. Coins like these can be valued based on their condition, scarcity, and demand in the numismatic market.