What is a Australian one-dollar coin?

The Australian one-dollar coin is the second most valuable circulation denomination coin of the Australian dollar after the two-dollar coin; there are also non-circulating legal-tender coins of higher denominations (five-, ten-, and two-hundred-dollar coins ).

When did Australia start making a one dollar coin?

Planning for a one dollar coin commenced as early as the mid-1970s. It was recognised that Australia needed a higher value coin which could be practically used in coin operated machines and to replace the one dollar note which had a short service life through high use. Mr Stuart Devlin was commissioned to design the reverse of the new coin.

Why are Australian 1 dollar coins so valuable?

The most commonly found of the three valuable Australian 1 dollar coins we’re talking about today it is the result of a loose obverse die during one die pair production run. The degree of rotation (or upset) changed continuously during the production run and as a result coins with any angle of upset can be found.