One major variety includes the 1807/6 Draped Bust Large Cent (Penny) overdate error - with a small "7" and blunt "1". This variety is extremely rare and valuable. This coin features an 1807 date struck over an 1806 date which resulted in parts of the underlying "6" being very clearly seen under and around the "7". The number "7" is also smaller than the "large 7" variety. The tip of the "1" in the 1807 date is also blunt at the tip - meaning it doesn't have a point coming off the tip like it does on the "large 7" variety. (Source of example image above is courtesy of Heritage Auction Galleries.)
One major variety includes the 1807/6 Draped Bust Large Cent (Penny) overdate error - with a large "7" and pointed "1". This coin features an 1807 date struck over an 1806 date which resulted in parts of the underlying "6" being very clearly seen under and around the "7". The number "7" is also larger than the "small 7" variety. The tip of the "1" in the 1807 date is also pointed at the tip.
Another major variety of the 1807 Draped Bust Large Cent (Penny) features a smaller fraction on the reverse of the coin. The numbers in the 1/100 denomination fraction are much smaller and further away from bow that extends down from the wreath when compared to the large fraction variety. The number "1"s also have much smaller notches extending from the tip.
Another major variety of the 1807 Draped Bust Large Cent (Penny) features a larger fraction on the reverse of the coin. The numbers in the 1/100 denomination fraction are much larger and closer to the bow that extends down from the wreath. The number "1"s also have larger notches.
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.