I'd never seen or heard of one either Rocket but the R.A.M said this about it:
"The iconic image of a rams head will once again grace Australias newest $1 coin as revealed on New Years Day at the Royal Australian Mint in Canberra.
Originally appearing on the one shilling from 1938 to 1963, the Royal Australian Mint has returned to this familiar design to recognise one of Australias longest running industries.
This new $1 rams head coin design continues our celebration in 2011 of Australian wool and the role it played in the development of modern Australia, said Assistant Treasurer, Bill Shorten.
The original design of the ram was modelled on a champion Merino at the Annual Sydney Sheep Show in 1932 and came to be known as the Shilling Ram, Mr Shorten said.
This collectible coin is an exclusive offer and one which will be sought after by many collectors. It is only available to make at our store in Canberra and bears a C for Canberra mark on it, making it a memento to keep forever, said CEO of the Royal Australian Mint, Mr Ross MacDiarmid.
The dies in the gallery press will be changed to the Rams head design on New Years Eve, giving one lucky visitor to the Mint on New Years Day the rare opportunity to strike the very first collector coin for 2011, Mr MacDiarmid said"
http://www.ramint.gov.au/media/press-releases/2011/20110101.cfm