The coins that could make you THOUSANDS

This rare 20c piece made in 1966 with a wavy baseline fault on the number ‘2’ is worth up $2000. The bottom of the ‘2’ is usually straight

Mr Thompson said most people don’t check their coins and pass on rare coins worth thousands of dollars by accident.

Others are keen to inspect every coin in their change jars, which is a process called ‘noodling’.

‘I’ve done it before if I’ve a bag of coins or change jars. If you just spend a bit of time going through them it can certainly pay off,’ he said.

Sometimes coins get clipped during the minting process when the discs are not ejected properly along the conveyor belt during the manufacturing process.

Many people reported finding ‘rabbit ears’ faults on their $1 coin in change

The blank disc can also get double-stamped by the high-pressure die.

‘People don’t expect institutions like the Mint to make mistakes,’ he said.

‘But from time to time things can go awry.  If you see mistakes on a coin, if you have something interesting, odd or out of place, then other people are likely to find it interesting, too – that’s why people collect.’

In 2000 a $1 coin was accidentally stamped with the head die from a 10c piece.

The coin is known as a ‘mule’, as it is the product of two different species of parents.

‘It (the head side) is slightly smaller, so it gives a double-ring effect,’ Mr Thompson said.

‘If you see two rings on your dollar coin, it could be worth a few hundred or up to $4000 in really good condition.’

Mr Thompson said there were about 6000 made, but it was unconfirmed so it was difficult to tell exactly how many might be out there.

A more common $1 variant is ‘rabbit ears’ on the hopping kangaroos, which can make a coin worth up to $30, depending on condition.

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