The misspelling appears in an extract from her first speech to the Western Australia state Parliament in 1921. The typo misspells the word "responsibility".
A listener of Triple M's Hot Breakfast morning show called in to point out that on the new $50 bill, which was put into circulation in October a year ago, has the word "responsibility" spelled wrong.
It reads: "It is a great responsibilty [sic] to be the only woman here, and I want to emphasise the necessity which exists for other women being here". Australia's Triple M radio magnified the relevant part of the note and highlighted the spelling mistake.
The total value of the misprinted notes is $2.3 billion.
The new note was brought into circulation in October 2018, with features to help visually impaired people distinguish between different denominations.
RBA Governor Philip Lowe said at the time: "Improved security and ease of recognition underpin the design of the new $50 banknote".
The $50 bill, worth $34.90 in United States currency, contains anti-counterfeiting measures including a flying swan and a holographic 50 that reverses when the note is moved.
While Australia averted disaster, the Philippines faced irreversible embarrassment in 2005, when it was realized that new bank notes misspelled the name of then-President Gloria Macapagal Arroyo. Forty-six million have been printed since the new version entered circulation past year.