This is a gold proof version of the mint set of Australian circulation coins issued in 2021. Unlike the sets in base metals, it contains the definitive "Aboriginal Elder" $2 coin and not a commemorative.
The Mint says about the set:
he Royal Australian Mint’s 2021 Gold Proof Year Set is a new benchmark in numismatic quality and attention to detail. This stunning set of six beautifully manufactured gold coins features Australia’s iconic circulating designs enhanced with striking new frosting and polished finishes to truly "gild the lily".