10 Dollars - Elizabeth II 4th Portrait - Australian Koala - Silver Bullion

The Australian Koala silver bullion series launched in 2007, positioning Perth Mint directly against the established Kookaburra series it had produced since 1990. The decision to run two competing large-format silver bullion programs simultaneously was commercially aggressive — the Koala's annual design rotation was designed explicitly to drive year-on-year collector demand, a strategy Perth had already proven successful with the Lunar series.

The 10-ounce format was among the heaviest struck in the inaugural years of the program, requiring dedicated handling infrastructure at the mint's bullion facility in East Perth.