Mexico Error Date 1870 instead of 1807 Eight Reales Contemporary Counterfeit with Assayer FM instead of FF

This is an amazing contemporary counterfeit Mexican Eight Reales which is also an Error. The date is written in 1870 instead of 1807 and the Assayer FM instead of FF or Antonio Forcada. The planchet is coated with silver and it is lighter compared to original Eight Reales just weighing only 25 grams.