The one dollar coin circulating denomination (written as $1) was introduced in Australia in 1984, replacing the earlier banknotes. The original reverse design by Stuart Devlin featuring five kangaroos - known in Australia as the "Mob of Roos" design - has not been changed since its introduction.
The denomination is also used by both the Royal Australian Mint and the Perth Mint to issue an extensive range of collector coins, which are legal tender in Australia - such as this one.
This coin was issued to mark 100 years since the last coach service of Australian company Cobb & Co.
The mint says about it:
The last ever Cobb & Co coach ended its final journey 100 years ago this year, leaving the name Cobb & Co firmly entrenched in Australian folklore.
Founded in Victoria in 1853 at the peak of the gold rushes, this horse-drawn coach service spread across Eastern Australia, contributing much to opening up the inland to travelers and new settlers. At the height of the 1850s Victorian gold rush, four newly arrived Americans, Freeman Cobb and three colleagues, saw the opportunity to launch a transport business, using horse-drawn carriages like those in the American west. From the first journey in 1853, Cobb & Co coach routes crisscrossed Eastern Australia, establishing a reputation for speed and reliability.
Although railways progressively connected major towns, Cobb & Co instead linked more distant communities. Horses needed to be changed every 15-25 kilometres at a network of waystations, often inns, directly contributing to the opening of rural Australia.
Cobb & Co's final journey came on 14th August 1924, ending the era of horse-drawn transport in Australia. The reason - the advent of reliable motor vehicles. The last ever journey, 65 kilometres from Surat to Yuleba in southern Queensland, is commemorated with the Royal Australian Mint's stunning new $1 collector coin. | 
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