200 Dollars - Elizabeth II 4th Portrait - Australian Kangaroo - Gold Proof Coin

The Australian Kangaroo gold proof series, issued annually by the Perth Mint since 1986, changes its reverse design each year — a deliberate policy that drives collector demand by ensuring no two years are identical. The 2018 issue is struck in .9999 fine gold, a purity standard the Perth Mint adopted to differentiate its bullion and proof products from the .9167 fineness of older sovereign-series coinage.

At two troy ounces, this sits in an awkward commercial tier — too heavy for casual collectors, too small for serious bullion stackers — which historically keeps surviving proof populations in better condition than their one-ounce counterparts.