The penny is the lowest mintage pre-decimal Australian coin in existence - a "numismatic superstar" with its value only rising, according to Lloyds Auctions chief operations officer Lee Hames.

"This penny has not only broken a record at Lloyds Auctions, but we believe it has broken an Australian auction record based on its grade, selling for $60k," Mr Hames said.

"Our previous record for a 1930s penny was $30k which we auctioned last year, and in 12 months the price has now doubled at auction."

The highly collectable coin is in good condition and features a partial diamond and six pearls on King George V's crown.

In 1929, at the start of the Great Depression, deflation and Australia's shrinking economy meant a lower demand for currency and the government did not order any pennies to be minted.

An accidental minting of the 1930 penny meant 3000 were produced - but only about 1500 ended up in circulation, with many of the coins damaged or discarded.

It is unclear how many remain in collectors' hands, according to Lloyds.

"A once by-product of economic depression is now a symbol of prosperity, the ultimate cherry on top for any coin collector," said Mr. Hames.

"We have been seeing an influx of collectables come into Lloyds Auctions with people wanting to sell their old or valued treasures to make some extra cash, and we encourage people to bring in their collectables to be valued."

Australian Associated Press