1994, Mexico. Aluminum-Bronze & Silver 50 Nuevos Pesos Coin

Mint Year: 1994
Reference: KM- 571.
Mint Place: Mexico (Mo)
Denomination: 50 Neuvos Pesos - Ninos Heroes
Material: Aluminum-Bronze (ring), Silver (.925)
Preciousl metal content: 1/2 troy oz (15.55gm)
Weight: 34.11gm
Diameter: 39mm

The Niños Héroes (Boy Heroes, or Heroic Cadets) were six Mexican military cadets who were killed in the defence of Mexico City during the Battle of Chapultepec, one of the last major battles of the Mexican–American War, on 13 September 1847. The date of the battle is now celebrated in Mexico as a civic holiday to honor the cadets' sacrifice. 

Mexico, officially the United Mexican States, is a federal constitutional republic in North America. It is bordered on the north by the United States of America; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of Mexico. Covering almost two million square kilometres (over 760,000 sq mi), Mexico is the fifth largest country in the Americas by total area and the 13th largest independent nation in the world. With an estimated population of over 113 million, it is the world's eleventh most populous country and the most populous Spanish-speaking country. Mexico is a federation comprising thirty-one states and a Federal District, the capital city.