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Most Mexican currency is made of nickel and copper alloys, but there are gold and silver coins called Centenarios and Onzas Libertad, respectively.
"Land and freedom" (Spanish: Tierra y Libertad)
mexican silver
Plata libertad coins weight 31.1 grams, or 1.097 ounces of pure silver.
It depends on condition. One 'plata libertad' coin like you just described would be worth up to US$34.00