A .20 estados unidos mexicano coin is worth about, well, nothing. If you have five of them, you could buy a piece of gum.
Better re-check the date on that coin. "Estados Unidos Mexicanos" did not appear on Mexican 20 Centavos coins until 1905. Before that, they said "Republica Mexicana". Most likely, you have a more current date on your coin. If your coin is silver, it likely has a value of a dollar or two. If it is one of the more recent bronze coins, you will find them in dealers' misc. foreign bins for 25 cents or less.
Please post a new and separate question with the coin's date and specific denomination. Is it 20 centavos or 20 pesos?
"Estados Unidos Mexicano" means "United States of Mexico" but aside from giving the country's name isn't specific enough information to ID the coin.
It's currently worth about $3.00
... as of 12/22/09
A .20 estados unidos mexicano coin is worth about, well, nothing. If you have five of them, you could buy a piece of gum.
estados unidos mexicano's
How much is a 1988 madero 500 worth
Your 10 peso coin is worth less than a penny U.S.
about 25 cents.
These are fairly valuable coins. A well worn coin is valued at $10. A coin in average condition is valued at $25. A well preserved coin in valued at $100. A fully uncirculated coin is valued at $500.
50cents
Cs = centavos
$60-80
answer
See the Related Link for an explanation.
10cents