hi there, You have a 1772 Spanish 1 Reale. it seems that after it was minted, somebody put a counter stamp in it. This coin is most likely this is worth around 8-10 $ .
it seems to be reference KM 78.1 you can find information here: https://en.numista.com/catalogue/pieces16850.html and here http://coinquest.com/cgi-bin/cq/coins.pl?coin=2334