What this coin looks like (obverse, reverse, mint mark location, special features, etc.):
The 1909 S Over Horizontal S (S/S) Lincoln Wheat Cent (Penny) is a rare Repunched Mintmark error. The "S" mint mark is stamped on top of a subtle horizontally aligned "S". One way to identify this is to notice a small portion of the under-stamped "S" sticking out from the right side and slightly above the primary "S" mintmark. This is depicted by the arrows in the example image above.
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD