1966 Wavy Baseline 20c

Struck at the Royal Mint in London just over five decades ago, as Great Britain assisted Australia in the lead-up to decimalisation, the 1966 ‘Wavy Baseline’ 20c is one of the rarest decimal coins issued into circulation in Australia. Defined by – as the name suggests – a distinct undulation in the baseline of the ‘2’ in the denomination (refer the right image below), this key type is among the most famous of Australian decimal Varieties.

1966 Wavy Baseline vs Standard Coin

1966 Standard 20c vs 1966 'Wavy Baseline' 20c

The most momentous landmark in the history of Australian currency, the changeover to decimal currency was an enormous logistical task. Quite literally, millions and millions of new coins were required for distribution on ‘C-Day’ – ‘Currency Day’, February 14, 1966 – to replace the coins that had served the nation so well since 1910.

Such was the magnitude of the task, the Perth Mint and the Melbourne Mint were joined by Australia’s then new Royal Australian Mint – created specifically to facilitate the production of the nation’s new decimal currency. To guarantee that enough coins were ready to go, the Royal Mint in London was also recruited to help.

Britain had played a key role in Australian currency production before, of course, striking all Australian coins from 1910 to 1915, as well as many of the coins for the George VI 1951 issue. Never before had the Royal Mint been required to strike such a huge amount of coins for circulation in Australia as it was asked to do in 1966.

Whilst the Perth Mint and Melbourne Mint struck copper 1c and 2c coins, the Royal Mint in London was recruited to help the RAM strike the cupro-nickel 5c, 10c and 20c coins. Thirty million examples of each denomination were struck in London, and among the thirty million 20c coins would ultimately be found the 1966 ‘Wavy Baseline’ 20c type.

Probably caused by a simple and slight variation in the production of some of the dies, the 1966 ‘Wavy Baseline’ 20c is distinguished by the obvious upward curve on the top of the baseline in the ‘2’. Not only very distinctive, the 1966 ‘Wavy Baseline’ 20c is extremely scarce. Although it is unknown exactly how many coins from the mintage are of this unique Australian Variety, there is no question that the 1966 ‘Wavy Baseline’ 20c is very scarce, regardless of the grade. A highly sought after Australian decimal variety, this coin fetches prices in excess of $4,000 on the rare occasions it is offered in Uncirculated condition.

If you are interested in securing this important Australian coin type – or, indeed, any other decimal Variety or rarity – then by all means contact Downies.