he reverse of the coin features a depiction of an adult koala sleeping in the fork of a eucalyptus tree. The inscriptions include “Australian Koala” above and “2013 5 oz 999 Silver” below. The Perth Mint’s “P” mint mark is also incorporated. The obverse contains the Ian Rank-Broadley effigy of Queen Elizabeth II with an inscription of the legal tender face value.
Both the obverse and reverse are minted on concave surfaces, which ensures optimum metal flow is achieved by the strike of the die. Each coin is struck to proof quality in 5 troy ounces of 99.9% pure silver with a diameter of 50.60 mm and maximum thickness of 12.50 mm.