The term 'Gold Coin of Old' can be summarized as a DUCAT, which is a five-letter word. A ducat was a gold coin that was used in Europe from the Middle Ages until the early 20th century. It was originally issued by the Republic of Venice in 1284 and was widely used throughout Europe for centuries. The ducat was also used as a form of currency in many countries, including Austria, Hungary, and the Netherlands. The ducat was eventually replaced by other forms of currency, such as the euro.