Mexico 1875 Ga MC 8 Reales

I'm terrible at grading these. Picked this one up in a foreign silver group. What grade would you assign, and how much is it worth in your opinion?

 

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Full snake across the eagle's breast. I'd say XF.

 

I haven't seen many of these in mid grades. Well worn Mexican 8 reales are relatively common and BU examples are in many collections, but there seems to be grade scarcity in XF.

Any opinions about value?