And the reverse (female) side goes out of the way to show that she has only 10 fingers. No arms or accoutrement's, except what is that kite or whatever by her head?
Now the rolled up paper is bothering me. Either he just "trained" the dog, or it's not Aztec. Weren't their codices (what ever the plural of codex is) narrow but very long and somewhat folded rather than rolled? Now we are back to early Christian, Jewish, and or lots of other options.
Are the red spots bits of mud or dirt, or are they (apparent) iron inclusions in the rock?