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A Melbourne mum has been shocked and excited after finding out she was sitting on a very cheap goldmine.
Most people would think that a $1 coin is worth just that, but small irregularities in the manufacturing process end up creating valuable coins known as Mules.
Tanya posted onto her Melbourne With Kidz Facebook page, showing how this tiny coin could be worth up to $3,000 or more.
She said: "Check your change and empty out the kids piggy bank! You could be sitting on a winner!"
Tanya went on to explain that this specific Mule coin is 'a small number of the year 2000 $1 dollar coins that had been minted using the incorrect obverse die (heads side) and released into circulation by mistake and only discovered a year or two later'.
"Royal Australian Mint accidentally minted the coins using the smaller 10 cent obverse die (head side) by mistake," she said. "With just a 1.4 millimetre difference in diameter between the 10 cent and $1 coin you can clearly see a double rim circle going around the edges of the coin.
"These errors are worth anywhere from $500 to $3,000!"
Most people probably wouldn't notice the mistake if it was sitting in their coin jar, but if you look very closely you can see the difference.
You should check all the spare change you have just in case you're sitting on a small fortune.
Drake Sterling lists a bunch of the Mule coins and some go above the $3,000 mark, which could give you a very nice holiday. Granted, this one is in mint condition with very little markings and scratches however if you have one then you'll still be able to get a decent bit of money for it.
But imagine going overseas or interstate for the cost of $1.
You can get a lot of things for something that small, just ask this Harry Potter book seller.
A rare first-edition copy of Harry Potter and the Philosopher's Stone that was bought at a table top sale for just £1 was expected to fetch around £30,000 at auction in London.
The book is one of a run of just 500 copies of J.K. Rowling's wizarding fantasy story that comes complete with original misspellings and typos.
The first-edition was published in 1997 by Bloomsbury and was bought as a holiday read before it sat in a cupboard for almost two decades before resurfacing.
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