Can you take an image of the reverse straight on? There is a variety of this coin that had an error with the frosting on the reverse, The frosting was applied in two stages one pass over all of the devises and a second pass that only did some portions of the natives clothing to provide extra frost/accent to those portions of the design. One die missed the pass that did the entire design ad only got the pass that accented certain features.
The first one showed up maybe six years or so ago, and I identified the cause. About a year later it was reposted where I again identified the problem and Mike Diamond asked to see it, and subsequently did a Coin World
article on it. I only know of one other piece that has shown up since then.
The angled image makes it a little difficult to tell, but I think this could be a third specimen. (There is a possibility that other have been found that I don't know about, but this variety is visually impressive enough that if a significant number of piece had turned up the variety would be better known.)