2005 Dancing Man Dollar mule
The Australian 2000 $1/10c mule is well known, having been discovered in the early 2000s. A number of other similar errors have since come to light - dated 2014, 2015 and 2020 - although their provenance is unknown, it is strongly suspected that they were illegally produced and smuggled out of the Royal Australian Mint.
A 2005 Dancing Man $1/10c mule was reported in the April 2025 Independent Coin News, having been discovered by collector Brendan Alves in February 2025 (Andrews, https://www.independentcoinnews.com/April_2025.pdf). Seemingly a Royal Australian Mint worker once again mistakenly used a 10c obverse die during the production of the 2005 Dancing Man $1 coins. $1 coins with double rims due to off-centre strikes are not uncommon, so most are disregarded as double strikes rather than mules, especially since the Royal Australian Mint is reported to have attempted to prevent the release of the 2000 dollar mules. This would explain why the 2005 mule went undiscovered for so long.
Currently only a single well-circulated example from circulation is known: no doubt there are others waiting to be found, but it remains to be seen if the error is limited to circulating coins or to just the Dancing Man $1 coins.