What this coin looks like (obverse, reverse, mint mark location, special features, etc.):
One major variety is the 1800/79 Draped Bust Large Cent (Penny) with the "Style 2" hair design on the obverse of the coin. The overdate error features a 1800 date struck over a 1790's date. The "79" shows up very clearly under the "80" - especially the "9" inside the "0" as depicted above. In addition: The design of the hair on the liberty is the newer one with the extra curl above the shoulder (known as Style 2 Hair) which was used starting in 1798 and later. The difference between the 1800 Style 1 Hair vs Style 2 Hair is depicted below in the example comparison image:
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD