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How much is a ( Estados Unidos Mexicanos Un Peso 1943) worth?
1926 estados unidos mexican un peso
$2.50 us dollars
Please post a new question with the coin's denomination.
Un peso 1966
It is .100 fine silver, it's nick name in Spanish, Feo means ugly do to it's low content and the fact they turn a ugly (rusty) gray and black.
Please look at the coin again to find the name of the country. All modern Mexican coins prominently show the country's name (Estadios Unidos Mexicanos, as you correctly surmised)
There are two different varieties of the 1981 Mexican 1 Peso, but both are quite commonly found on the collector's market. In circulated condition, the values start at about 25 cents, with a maximum of 90 cents to $9 (depending on variety) in perfect uncirculated condition.
Your coin is made of stainless steel rather than silver. I'm afraid I have to inform you that you have an ordinary circulation coin. The Mexican peso is worth about 10¢ U.S. and there are 100 centavos in a peso, so a 10-centavo coin is only worth one U.S. penny.
You are asking about a coin from Mexico ("ESTADOS UNIDOS MEXICANOS" is Spanish for the "United Mexican States", Mexico's official name) dated 1993, but you would need to know the denomination and condition to value it. Denominations of 5, 10, 20 and 50 Centavos, and 1, 2, 5, 10, 20 and 50 Pesos were produced in 1993. None of the centavo coins are worth more than a dollar or so even in uncirculated condition, although the 1, 2, and 5 peso coins may be worth a couple of dollars even in Extremely Fine (that is, slightly circulated) condition. The 10, 20, and 50 Peso coins are bi-metallic, with silver in the center, so they will have value as silver separate and apart from the numismatic or exchange value.
Runaway inflation during the 1980s reduced the value of the peso to almost nothing. Mexico was forced to withdraw its old currency and replace it with "new pesos" in 1992 and 1993. Unfortunately the old pesos traded at about 10,000 to the dollar so 1000 old pesos are worth around a dime.
You are asking about a One Peso coin from Mexico (KM#459). The coin is 34.5mm in diameter, weighs 16 grams, and is 10% silver, giving it an ASW (Actual Silver Weight) of 0.514 troy ounces). The front has a portrait of a man facing right within a wreath. The back has an eagle with a snake in its mouth within a wreath, with "ESTADOS UNIDOS MEXICANOS" (Spanish for the "United Mexican States") above and "UN PESO 1960" ("One Peso 1960") below. The edge reads "INDEPENDENCIA Y LIBERTAD" ("Independence and Liberty"). 26,259,000 such coins were produced in 1960 at the Mexico City mint. With silver at US$33.80 per troy ounce (as of July 1, 2011), the "melt" value of the coin is about US$1.74. According to the Standard Catalog of World Coins, the coin is only worth its silver value in circulated condition - in Uncirculated it is valued at US$3.25, and in Brilliant Uncirculated, US$4.50.