Brits are being encouraged to rifle through their change jars for a rare 20th Century coin could make you almost £40,000.
Due to low mintage, a George V sovereign Sydney mint could fetch between £8,500 and £37,500, depending on its condition.
Anyone who owns a 1926 edition of the sovereign should check the side of the coin for an S - showing it was made in Sydney and hugely increasing its value.
Records on londoncoins.co.uk show that a 1926S sovereign was indeed sold for £18,000 in September 2014.
And despite not reaching anywhere near the experts' valuation, one of the coins is currently available on eBay for a tidy profit-making £2,500.
Since 1871, British sovereigns were struck at branch mints around the Commonwealth, as well as at the Royal Mint, in London.
Sydney was the first branch mint and more followed in locations that were rich wiith gold mines.
More followed in Melbourne, Perth, Ottawa, Bombay and Pretoria.
It comes as Britain prepares to welcome a new 12-sided £1 coin from March.
The news comes as Britiain prepares to welcome a new 12-sided £1 coin from March.
Households are being warned to spend or bank all their round pound coins before October, when they will cease to be legal tender.
And around the same time, new coin designs will start appearing in the shops, including a Jane Austen £2 and a 50p celebrating Sir Isaac Newton.
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