The weight and gold content of the Liberty Half Eagles was specified under the Coinage Act of 1837. The denomination carried a composition of 90% gold and 10% copper, with a weight of 8.36 grams or 129 grains. The diameter was 22.5 mm from 1839 to 1840, but reduced to 21.6 mm for the remainder of the series. All coins have a reeded edge.
![Specifications](http://libertyhalfeagle.com/wp-content/uploads/2011/11/specifications.jpg)
Production for the series would take place at the Philadelphia, Carson City, Charlotte, Dahlonega, Denver, New Orleans, and San Francisco mint facilities. Coins struck at Philadelphia do not carry a mint mark. The mint mark for coins struck at the other facilities appears on the reverse of the coin between the eagle and the denomination.