Numis Network's Silver Coin of the Month for September 2011 is the Mexican Libertad. The obverse of this beautiful one ounce silver coin features one of the country's most important symbols of politics and culture, the Coat or Arms of Mexico. It depicts the nation's national bird, the golden eagle, perched upon a prickly pear cactus while devouring a rattlesnake. It is an important symbolic image that recalls the legendary founding of Mexico City by the Aztecs in 1325.