The product is a 1991 Mexico .999 Silver Libertad 1 Onza coin graded as Uncirculated details Cleaned by NGC. This key SMALL ONZA coin is minted by the Mexican Mint and contains one ounce of silver with a fineness of 0.999. The certification number for this particular coin is 8485773-001. The Mexican Libertad coin is a popular choice among collectors and investors due to its high silver content and unique design.