5 Dollars - Elizabeth II 4th Portrait - Platypus, Gold Bullion Proof

Australia's one-tenth ounce gold bullion proof series from Perth gained traction in the mid-2000s as the mint aggressively expanded fractional gold offerings to reach retail investors priced out of the full-ounce market. The 2007 date falls squarely in the pre-financial crisis window when gold was climbing toward $1,000 USD per troy ounce, and collector-investor demand for proof bullion was near its peak. Perth's .9999 fineness standard — four nines — was a deliberate competitive move against the Royal Canadian Mint's Maple Leaf, which had held the purity benchmark since 1982.