What this coin looks like (obverse, reverse, mint mark location, special features, etc.): This is a Jefferson Nickel mintmark variety. Depicted in the image above: The D mint mark is stamped on top of a subtle S mint mark. Typically this can be best identified by a small upper portion of the S mark being seen above the upper portion of the D mark as pointed out by the arrows.
Coin value chart: Typical coin prices, values and worth in USD based on grade/condition