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Do you have this valuable $1 coin?
It's a $1 coin known as the Year 2000 $1/10c mule - and it's worth a small fortune. Up to $3000, in fact.
Apparently, it's because a Mint technician in Canberra accidentally paired the mob of ‘roos dollar tails with a Queen’s head dye normally used for a 10 cent piece.
Read more from Maxine Brown: There's hidden treasure in your loose change
The slightly smaller size of the 10c piece resulted in the thicker double rim.
And if you're thinking of buying one on eBay, be careful of the scammers. All Year 2000 $1/10c mules have double rims. But not all coins with double rims are mules - despite what some sellers will try and tell you.
To be a mule, the coin must be $1 - and it must be from the year 2000.
Here's how to tell if you have one.
Is it an Australian $1 coin from the year 2000? Yes? Good!
Flip it over to the Queen's side, look at the outer rim. Is it thicker than usual, looking like a double rim?
Congratulations! Now, depending on condition and remembering these coins have spent 17 years in circulation, you could be sitting on a small fortune.
These coins trade for anything from a few hundred dollars to up to $3000.