The product is a 1979 Mexico Silver Onza Casa de Moneda coin made of 0.925 sterling silver. It weighs 33.625 grams & has a total silver weight of 1 oz and is uncirculated. The coin has not been certified and has no certification number. The design features the Casa de Moneda building and the denomination is Onza. It was minted in Mexico during the historical period of Mexico (1905-Now).