What this coin looks like (obverse, reverse, mint mark location, special features, etc.):
This variety is extremely rare and valuable and features a single leaf on the branch under the eagle's wing on the reverse of the coin. This feature resulted due to the die being lapped. An example comparison image of the 1812 double leaf vs single leaf half dollar is depicted above. Source of single leaf example image is courtesy of Heritage Auction Galleries.
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD