The Royal Australian Mint has issued quitea number of Medallions in various metals
This one is from 1966 and is dated with an issue of the 14th of February (the day decimal currency was introduced into Australia) and is quite a nice medallion. All the animals used on the coinage are displayed on one side of the medallion
Silver Version of the 1966 Ram Medallion (number 171 on the edge)
The reverse actually celebrates the Duke of Edinburgh opening the Canberra Mint in 1965 on the 22nd of February

RAM Medallion 1965/66

RAM Medallion 1966/65

This also comes in a bronze version

Here are the lower res photos from the above links

Here is a 1970 Medallion after the 50 cent was changed in design from a circular ro a dodecahedronal shape

love aussie coins

These medallions are getting hard to find in pristine condition - I'll dig a few more out and post them. I have some old pre decimal ones as well

Neat stuff.

Nice medals. I like the production theme.