The Australian 20 cent coin was first introduced with decimalisation on 14 February 1966 when it replaced the pre-decimal Australian florin, to which it is equal in size and mass. The original reverse design by Stuart Devlin has not been changed since its introduction.
The denomination is occasionally used by both the Royal Australian Mint and the Perth Mint to issue collector coins, which are legal tender in Australia - such as this one.
This coin marks the 90th Anniversary of the Australian Broadcasting Corporation (ABC) (named Australian Broadcasting Commission before 1983).
The mint says about it:
For nine decades, the ABC - Australia’s national broadcaster, has told the Australian story through a myriad of platforms and media. From its beginnings in radio, through to the introduction of television and the rise of digital media, "Aunty" (the service's nickname) has always been there to inform, educate and entertain us.
These coins are Non-Circulating Legal Tender (collector issue). No coins of this type have been released into circulation. | 
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