Your quarter could be worth $93,000 - the exact 'planchet' error to look for

A QUARTER mistakenly struck on a 19th-century gold coin has sold for nearly six figures online.

The rare coin, which sold for $93,000 in a Heritage Auction in January, features the original design of the Washington quarter.

The sale was spotted by rare coin TikTok channel (@treasuretown), who profiled the coin to nearly 59,000 followers.

Minted in 1970 at the San Francisco Mint, the quarter was mysteriously struck on the planchet of an 1898 $5 gold half-eagle.

This is called an overstrike error, which occurs when the design of one coin is mistakenly struck on the planchet of a different piece.

This is one of multiple 1970-S overstrike errors to surface on the rare coin scene, according to Treasure Town.

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"There was a lot of mischief going on that year," he said.

Adding to this quarter's allure is that it was a proof coin, which is considered the "finest quality of coins" by the Mint.

Proof coins are specially made early samples that test out the variety's design.

Minor mistakes, let alone major overstrike errors, are especially rare for proof coins.

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It remains a mystery why a 1970-S proof quarter was made on a gold planchette from 72 years prior.

Another point is the quarter's number grade.

It is rated PR66 by Professional Coin Grading Services.

According to PCGS, PR66 coins are "well struck with a few marks or hairlines, not in focal areas."

And grading scales only run up to 70 – so this is four points off from a flawless score.

WHAT TO LOOK FOR

While this is the only known version of this error, there are a couple of key details to look for if you think you have another one.

You will want to make sure the quarter bears the 1970 date, was minted in San Francisco, displaying an S letter mark.

While the planchet is clearly gold, other aspects of the error require closer inspection, according to a description from Heritage Auctions.

"This is not an obvious error. A strong magnifier and patience are required to see the undertype," the description reads.

If you think you have this extremely rare error coin, you will want to have it professionally appraised by an expert.

MORE ERRORS TO LOOK FOR

The U.S. Sun reported on a similar error last year.

Multiple 2000 Sacagawea Dollar Coins were mistakenly made with the obverse of a quarter, giving it a gold-like look.

This is called a mule error, which is when the obverse or reverse does not match up with the coin's intended design.

Versions of that mule quarter have sold for over $140,000 at auctions.

Another lucrative mule error was found on a 1993-D Lincoln Penny.

The penny had the reverse design of a dime.

It sold for $51,750 at auction.

Read More on The US Sun

Check out our round-up of pennies worth between $1,900 and $1.1million.

And see a $2 bill that sold for $19,000.

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