whatever 1.66 grams of gold is worth - but remember you need to take about 15% dealer price off if you sell to a dealer and add 15% if you are buying - commission - about £30 - 35 - cheack out the "gold spot price"
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More information is needed. If the coin is dated 1993 or later it's only worth its current exchange rate which has been USD 0.10 or less for several years.
If it's older, please post a new and separate question with the coin's date.
This is a relatively common coin that you can find in dealers' miscellaneous foreign bins for about 20 cents.
When I look up the 1958 Un Peso I find a mintage of almost 42 million. It features Jose Morelos y Pavon and has a catalog value of $2.50 US in uncirculated condition.
The maximum they can give you is $3,000 US dollars. This coin is very rare. That's why many collectors want to add it to their collection.