SYDNEY - The Reserve Bank of Australia is reeling on Thursday after a local radio station posted a photograph to social media highlighting an embarrassing spelling blunder on the country's new 50 dollar note.

Uploaded to Twitter, Triple M shared the image which was sent in by a listener, showing the word "responsibility" misspelt three times as "responsibilty."

Although the note has been in circulation since October last year, it hasn't previously been detected because the writing appears in 'reverse text' which is only detectable via microscope.

Intricately created with tactile features, Australian Treasurer Josh Frydenberg said at the time "this latest and important upgrade not only marks a hugely significant step towards equal access to society for people who are blind or have low vision, but also incorporates new, innovative security features that further protect against counterfeiting."

"The application of the tactile features to the 50 dollar note is particularly important given that it's the most widely circulated banknote, with 46 percent of all banknotes in circulation being the 50 dollar note."

Taken from a parliamentary speech in 1921 by Edith Cowan, a social reformer who fought for the rights of women and children, the entire excerpt featured on the note reads, "I stand here today in the unique position of being the first woman in an Australian parliament."

"It is a great responsibility to be the only woman here and I want to emphasise the necessity which exists for other women being here."

"If men and women can work for the state side by side and represent all different sections of the community, I cannot doubt that we should do very much better work in the community than was ever done before."

According to rare currency dealer Jim Noble from Noble Numismatics, this is the first time the Reserve Bank of Australia have ever made a "typo" on any circulating currency.

"They do misprint notes but they're individual happenings rather than the whole production," he told News Corp.

"Obviously someone would have to have looked at that enlarged and looked at the finished product before going to printing. How could that be approved?"

"I'd say that's a very serious and embarrassing error for everybody responsible. The buck stops with those who are producing it. It's a joke for Australia."

In response to the matter, a spokesperson for the central bank said "the Reserve Bank of Australia is aware of it and the spelling will be corrected at the next print run."