It’s a good idea to check your change because you could be sitting on a small fortune. An Aussie man shared he stumbled across an odd-looking $2 coin when getting change at the servo and it could be worth thousands.

The Aussie shared a picture of the $2 coin, which appears to be the 2020 Firefighter $2 coin with a “bullseye error”. The coloured coin created to pay tribute to those who battled the 2019 bushfires features an error, where the ball of flames meant to fall between two firefighters is on the Queen's face.

The coloured coin was created to pay tribute to those who battled the 2019 bushfires and features an orange ball of flames at the centre.

"Is this a rare find?" he asked.

Coin expert Matthew Thompson of Thompsons Coins and Collectables told Yahoo Finance it was unclear how many of the error coins were created.

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“No one knows for sure which is sort of why they’re so popular and collectable because the amount out there that’s available would be really small. But no one knows a definitive production run on them,” Thompson said.

He said it was “very uncommon” for the Royal Australian Mint to make mistakes like this one, which was why the coins were so popular and could be sold for thousands of dollars.

Downies Collectables recently sold an uncirculated version of the error coin for a staggering $5,950.

Given this particular coin was found in change, Thompson said it wasn’t likely to fetch as much as $6,000 but could still be worth thousands if it is legitimate. That’s because how worn, or circulated, the coin is will impact its value.

“It’d be worth a few thousand … If it has been identified straight out of the Mint and put aside it would be worth a lot more,” he told Yahoo Finance.

“If this guy has got it from the servo, it sounds like it’s probably been in a till, it may have been knocked around a bit and all those things contribute to a value.”

Warning for coin collectors

The catch? The coin’s value will all depend on whether or not it is a legitimate error coin.

Thompson said he was aware of fake versions of the firefighter coin where people manually transferred the fireball paint onto the other side of the coin.

“It’s important to be super wary with errors like that. People get caught out from time to time and end up losing thousands so it can get pretty risky,” he said.