AUSTRALIA. 30 Dollars (Silver Kilo), 1997. Perth Mint. GEM PROOF.KM-495. Diameter: 100mm. Mintage: 1,400. This massive silver issue, featuring a full kilogram of silver, presents a delightful reverse proof feel, with tremendous brilliance to the devices and an alluring frosted nature to portions of the fields. <strong>RARE </strong>and highly attractive.