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I think you need to double-check that date -- it should be 1982 -- Mexico was a republic in 1882. Unless the coin says onza plata pura (1 ounce pure silver), it's value is negligable -- maybe a couple cents. An onza is currently worth about $10.00 The coin you have is : = REPUBLICA Mexico 1882 LIBERTAD .8R .Z .1882. J. S. 10D. 20G. COIN. It is 46.5% silver and today is worth about 10US Dollars = = ********* = = Pls reference this web site: = = http://www.identificacion-numismatica.com/otras-incluso-extranjeras-f6/r-mexicana-8-reales-1882-t22318.htm = = According to this site, the 10D 20G refers to the purity, where 12D is pure silver and each D equals 24G. = = So, the coin weighs about 27 grams, or about 2/3 of a troy ounce, and is about 90% pure. =

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