Although usual design elements are there, the coin just don't have the proper design ...
It's an imaginary imitation of a spanish 1 reale cob minted in Potosi, mixed between a normal and a royal-style type.
And then, the details are not correct, it clearly comes from a mold, it's not a striked coin (the edge of the letters are smooth, the background of the coin looks like a sponge ...)