2013 $8 Australian Koala 5oz Silver High Relief Proof CoinThe coins reverse depicts an adult koala sitting on the branch of a eucalyptus tree, surrounded by gum leaves. The design includes the inscription AUSTRALIAN KOALA, The Perth Mint's P mintmark and the 2013 year date. The coins high relief reverse and obverse are minted on concave surfaces to ensure the optimum flow of metal is achieved by the strike of the die.