1921 Square Penny

1921 Square Penny Type 12 Unc obv Large February 2019
1921 Square Penny Type 12 Unc rev February 2019
1921 Square Penny
1921 Square Penny
Private Collection Adelaide
This coin, the 1921 Square Penny, is the most popular coin in the entire kookaburra square coin series. It has the exclusivity that rare coin buyers always look for. And importantly, it is affordable. The Square Penny is history. A point in time when the Australian Federal Government planned the introduction of square coinage. It is the historical angle that ensures sustained buyer interest, underpinning its investment value. We would sight one high quality Square Penny of this style on the market perhaps once every year. As a point of comparison, we would sight at least twenty to thirty 1930 Pennies during the same twelve-month timeframe.
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1921 Square Penny Type 12 Unc rev February 2019
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The Square Penny is viewed as one of Australia’s classic coin rarities along with our first silver coins, the Holey Dollar and Dump. And our first gold coins, the Adelaide Pounds.

The coin never fails to engage its owners. And generates excitement.

It is the unique shape. Its place in history and its overwhelming rarity.

This Square Penny is known as the design type 12 and we estimate that perhaps 40 examples are available to private collectors.

But, we are as picky with our Square Pennies as we are with our 1930 Pennies.

And if you factor quality into your purchase equation you will find a tiny pool of about 20 to 30 nice quality design type 12 Square Pennies available.

Again, a comparison with the 1930 Penny (where it is believed 1500 are known) highlights the extreme rarity of this Square Penny.


The Square Kookaburra coins were thrown into the spotlight in 1954 when Sir Marcus Clark O.B.E. sold his extensive and famous collection of Australian coin rarities.

It is on record that his 1921 Square Penny and 1921 Square Halfpenny sold for £36. Even more interesting is that in the same auction an Extremely Fine Ferdinand VII Holey Dollar sold for just over twice that amount at £72 10/-. (The investment potential of the Square Penny and Square Halfpenny lies in the fact that the Holey Dollar is now a $450,000-plus item.)

The popularity of the kookaburras continued throughout the 1960s and 1970s with extensive reporting of their appearances occurring in the then industry magazine, The Australian Coin Review.

Strong collector and investor interest in the Square Kookaburras continues to this very day.

That interest in the series spans more than half a century is comforting for new buyers entering the market.

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