If this is a 10 Centavos coin with the Aztec Calendar Stone on the other side ,it is listed in the Current coin of the World price book as being copper-nickel. To be silver it has to be 1935 or before.
F&W !! But don't want anyone mad at you so gona let you know I have about 30 of these and they arent silver they are cupronickel brother!! not trying to be a but hole just trying to keep you from making someone mad at you !!! They are very neat Mexico coins though and great to collect!!!