I have confirmed thus far that the coin I have is of Ferdinand and Isabella. It bears the arms of Castille & Leon, the throne of Spain, one one side and the reverse has the arms/arrows detail. Basically it is the coin seen in this thread: http://www.cointalk.org/showthread.php?t=1486 However, my coin is goldish in color and I started my search by looking specifically for gold coins. I found this instead, and have seen no gold varieties of it. Would this imply that my coin is counterfeit? Thanks for any input!