What this coin looks like (obverse, reverse, mint mark location, special features, etc.): One major variety of the 1807 Draped Bust Large Cent (Penny) is the "Comet" variety. The dies used for striking the obverse of the coin had a large defect. This resulted in a "comet" shaped feature just behind the liberty head and extending to the rim of the coin as depicted by the arrow in the example image of this coin above.
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD