As a kid, I saw a few of these brass gaming chips. My dad explained to me what they were. Although I was intrigued by these items, I also thought 'Perhaps one day I may be able to get a real gold one!'
I finally did get a real gold George 111 Spade Guinea of 1791 a few years ago.
These coins are important to early Australian numismatic history. The Guinea is mentioned as legal tender in a Proclamation of Governor Philip Gidley King, in the early history of the New South Wales Penal Colony.