Queen Elizabeth II 100th birthday 4th coin to add to 90th birthday 3 coin set?
(http://www.australian-coins.net/gallery/albums/userpics/11534/s-l1600_28129.jpg)
Currently on Ebay bid at $56.
http://www.hobonickels.org/what_is.html
Just sold for $113us, about $150aus. I might have to take up a new hobby.