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Rare dollar coin could be worth $11,700 - the exact 'planchet' detail to look for

A DOLLAR coin minted on the wrong planchet can be worth nearly $12,000.

A select few 1999-P $1 Susan B. Anthony Dollar coins were mistakenly struck on the planchet for the Sacagawea dollar coins.

The error and sale were recently profiled by rare coin TikTok influencer @Treasuretown.

Treasuretown noted that in 2000 the mint had switched the dollar coin from the gray Susan B. Anthony coin to the gold-colored Sacagawea coin.

Yet, in 1999, which was the Susan B. Anthony coin's final year, a handful of the coins were made on the planchet of the soon-to-be Sacagawea coin.

This is known as a transitional planchet error coin, and they are quite rare and sought after.

While these coins are rare, there are some out there.

You will first want to check to see if your gold-colored coin is dated 1999.

The first gold-colored dollar coins were not minted until 2000, so the date is the first sign you might have this error.

Then you will want to make sure the woman on the coin is Susan B. Anthony, not Sacagawea.

Lastly, you should check the coin for its quality.

This coin is ranked MS65, which is just five points away from a top score of MS70.

Most importantly, you will want to get your coin professionally appraised by an expert grader like Professional Coin Grading Service (PCGS).

Coins that have the wrong die, design or the elements of another coin are some of the most valuable error coins.

Some of these errors are 'mule' errors when the design of one coin is mistakenly put on one side of another coin.

A mule penny that mistakenly had the reverse design of a dime sold for $66,000.

Another dollar coin, a 2000 Sacagawea coin with the obverse of a quarter, could be worth well over $100,000.

And most incredibly, a 1970s quarter minted on the planchet of a gold coin from the late 19th century sold for $93,000.