I hate to be the bearer of bad news, but in my opinion it is a reproduction. First of all, Mother-of-Pearl was not available to the population until much later at the turn of the century, coming from the area of the Philippines, and that is why abalone shell was used so much. Secondly, from what I have seen of actual researched pieces, the blade seems a little cruder than it should be and the stem should not be beaten like this. Third, I am not sure that the blade work is correct, it should be more hollowed out more, though some blades may not fit this profile perfectly.
I would suggest going to the Antiques Roadshow website and look up those experts that deal in Native American things. I emailed pics of an Apache bag brought back by one of my great-grandfathers and they id' it with pricing. They would be able to tell you for sure if it is genuine or repo and more. If you do, let us know the results. I too dable in NA things (having Cherokee, Filipino, and Scots-Irish blood myself
).