Native American Indian? Button backmark

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need help with identity of this back mark and time period

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[Aguest]

::::: United Indian Traders Association ::::: I guess that is the number "3" but it's hard to tell with some tarnish around it. :::::
:::::::::::: If that is the number three then = "Toadlena Trading Post or Two Grey Hills Trading Post, NM". :::::::::::::

[buttonbug]

Aguest , thank you very much, your correct it is a 3, do you know the time period? is it sterling are their any website's for more info. on Native American Buttons?
Deb

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Aguest I just searched "United Indian Traders Association" and found a very informative article on http://www.azarchivesonline.org. Thanks again.