Small & Large 5 cent Echidnas
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Earlier this year (2004) two different Reverses for the 1984 5 cent coin were brought to light, these Reverses are different in size. John Cook, the President of the Metropolitan Coin Club of Sydney, found the coins as mentioned in the Australasian Coin And Banknote magazine (CAB) article.
A later article in CAB, where Lyndsay Bedogni notes that the same difference in the Reverse occurs in the 1986 mint set only coin.

Below is the image of a large and small Reverse "echidna", both are 1986 PROOF 5 cent coins.

Spotting the difference between the two different Reverses can be easily done, check the distance between the rim and the designer initials at the bottom of the coin (K-6). It should be noted when checking these coins, also check the top to ensure it is not slightly off-centre.

To date I am not aware of any 1985 5 cent coins having the large Reverse, this does not mean that there are none.

1984 small Reverse appears to be the more common of the two.
1985 mintset only coin, small Reverse is common.
1986 mintset only coin, appears to be an equal amount of small and large Reverses.
1986 PROOF coin, appears to be an equal amount of small and large Reverses.
Note - 1985 had a new Obverse on all denominations

Article with John Cook's find CAB Feb 04 - v7n1 p52
Lyndsay Bedogni's article CAB April 04 - v7n3 p30

Happy Hunting