I was under the impression that this coin was only obtainable from the Mint or do they classify a "counterstamp" coin differently to their initial info on this coin
" 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,"
Of course you can only get the C for Canberra mark from their shop! I understand that it is the coin thats being pressed at the mint but took it to mean that you cant obtain the coin from anywhere but the mint regardless of any stamps or marks.