You are looking at a .903 Silver Mexican coin, 8 Reales. This coin weighs roughly 27 grams and was struck in Mexico City. There are a number of varieties of the 1883, but this is the P.I. - M.H., #K377.12. There is an overdate variety of this coin, and I am just not sure if this is one or not. Take a look at the photos. Regardless, this coin only had about 1.5 million minted, so how many do you believe are left? Thanks for looking!