Looks to be a 15th C. or 16th C. Perhaps of the "Catholic Monarchs" period? Found some similar at this forum: http://www.coincommunity.com/forum/topic.asp?TOPIC_ID=119506
Thanks, but I don't think that this coin is a copper Maravedi, its way to thin to be a maravedi, the metal is silver(ish), and the design doesn't match.