I found this Sacagawea Dollar in a roll. To me it looks like the baby has eye brows and a Mad look on it? I've add 2 photo's First one with the eyebrows, and a 2nd one from another coin with out them? (from the same Roll) not sure what to think? but I've searched and searched and can't find anything on this Error if in deed it is a Error.
Most likely one coin was struck better than the other. A weak strike will not show the same details as a strong complete strike.
1st pic has less light and all the little blemishes are easily seen and interpreted as something else