Depicts the seal of the United Mexican States.

The Seal of the United Mexican States is a modified version of the national coat of arms, with the addition of the full official name of the country Estados Unidos Mexicanos, in a semi-circular accommodation in the upper part of the seal. Current and past Mexican peso coinage have had the seal engraved on the obverse of all denominations.

The coat of arms depicts a Mexican golden eagle perched on a prickly pear cactus devouring a rattlesnake. To the people of Tenochtitlan this would have strong religious connotations, but to the Europeans, it would come to symbolize the triumph of good over evil (with the snake sometimes representative of the serpent in the Garden of Eden).

At the center, the image of the reverse of a Peso de Bolita (Little Ball), 1 Peso 1913 (KM# 610), minted in Hidalgo del Parral, Chihuahua; at the upper side, parallel to the coin frame, the legend NUMISMATIC HERITAGE OF MEXICO; on the left side, the Mexican mint mark, while on the right field is the $100.

The Little Ball Peso is one of the most famous coins of the Mexican Revolution (so called for the circle over the denomination). The coin was part of the first Villa mint and was probably ordered by Francisco Villa himself or by General Maclovio Herrera in October 1913. Its rough cut reflects the precarious conditions in which most coins were minted during the Revolution.