What This Coin Looks Like (Obverse, Reverse, Mint Mark Location, Special Features, etc.): This is a D Over S (D/S) Jefferson Nickel mintmark variety. In the image depicted above: One way to determine this error is there will be a D stamped over a subtle S mint mark with the S being most noticeable on the left-hand side of the D mark.
Coin Value Chart: Typical Coin Prices, Values and Worth in USD based on Grade/Condition