Is this natural desert patina?

I just picked up this Trajan as. The contrast really appeals to me and it seems to be in a good state of preservation. I realize that “desert” or sand patina is often faked. Does the coin being in a comment free NGC holder signify that the patina is most likely natural? It’s in an economy NGC holder but I’ve seen those holders with comments as well.

Also the patina completely covers the edge.

 

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I’m by no means an expert but I’d say yes.

 

Looks perfectly normal to me. Nice coin.