1991 Australia 1 oz Platinum Koala BU

---

In 1991, Australia continued its celebrated series of precious metal coinage with a brilliant uncirculated release featuring one of its most famous native marsupials. Struck from one troy ounce of highly refined 0.9995 fine platinum, this legal tender coin carries a face value of 100 dollars, fully backed by the Australian government. The reverse side of the coin presents a detailed depiction of a koala in its natural element, scaling a tree branch. This naturalistic portrait is paired with inscriptions indicating the coin's weight, platinum purity, and the name of the series. The Perth Mint, an institution with a long history dating back to its opening in 1899, produced this issue with a total mintage of 52,106 pieces. On the obverse, the coin displays the right-facing profile of Queen Elizabeth II. Surrounding the royal effigy are inscriptions denoting the monarch's name, the year 1991, and the 100 dollar denomination. The contrast between the frosted details of the design and the brilliant fields highlights the exceptional craftsmanship of this platinum release.