Cuban centavos are they silver?

[Cold-Silver]

I have seen early (1920's)Cuban centavos 1, 2, 5 listed on ebay as silver but my world coin book which has been excellent so far shows them as copper - nickel. The coin itself shows what looks like a purity and weight marking. Is the silver content so low the book does not bother to list it, or am I missing something? Also whats a good reference for just world silver coins?

[Bluegill]

Stay with what the world coin book says. Those coins are CuNi. The 250 M you see on them is as far as I can tell is the percentage of Ni in them, 25%.

Post revolution coins that had Ag in them start at 10 Centavos. The 1,2 and 5C are base metal coins.

[Robarons]

Cuban coins are very annoying when coming to silver content. The y look like silver, but are not. They are indeed CuNi.

Pretty sure Cuban coins that re silver are marked with their purity, .900 on the coin.

[OtusLotus]

Centavo 1915-1938 Copper-Nickel
5 Centavos 1915-1920 Copper-Nickel
10 Centavos 1915-1949 0.9 Silver 0.0723 oz. ASW
20 Centavos 1915-1949 0.9 Silver 0.1447 oz. ASW
40 Centavos 1915-1920 0.9 Silver 0.2893 oz. ASW

[Cold-Silver]

Thanks for the info guys, I have just never heard of a coin that has markings for purity and weight and was not a precious metal. I always thought a purity or weight marking made a coin almost an instant snap up at the coin store.