The half dime was one of the original denominations introduced almost as soon as the United States coinage system began. The half dime denomination was authorized April 2, 1792, by Congress, making it one of the initial denominations authorized for currency in the United States.
The William Kneass introduced, in 1829 a half dime design known as the Capped Bust design. The denomination appears on the coin for the first time, being expressed in abbreviated form as five cents.
Designer: William Kneass
Diameter: 15.5 millimeters
Silver - 89.25%
Copper - 10.75%
Weight: 1.35 grams
Mint marks: None (all coins of this type were struck at Philadelphia)