Compania Telefonica Telegrafica Mexicana

[just-dig]

I don't have any pictures yet but I dug a nickel size copper token today. The subject of this post tells what one side says. In the center on this side it has an old telephone and Mexico in the background. The other side says good for one call in Spanish, then in english at the bottom it says Local. There's a slot cut through the center. I found a little bit about the company online but nothing about the tokens. Does anyone know anything about these?
Thanks.