Harder to find these Mint Error Coins in the Kennedy Half Dollars. Most are found in nickel's.
Most awesome colors the images I took were with LED and Sunlight Both. This is a great example of a improperly cladded, or any number of other problems that occur during coin manufacturing.
The planchets improperly produced, so they are too thick or too thin. Improperly cladded results in Black Coins like this.