I have a coin and would like to know the value of it. The heads side states clearly, "Dei Gratia" "Carolus III" 1773 The tails side states clearly, "Hispan Etindrex" then some sort of symbol, then "J.R." The heads side portrait's face is not easily determinable as a result of natural wearing. The tails side center diagram is quite clear with crown, coat of arms, and columns. There does not appear to be any holes in it whatsoever. Any information regarding this coin would be greatly appreciated. Thank you!