A series of dimes bearing the face of United States President Franklin D. Roosevelt but missing a mint mark released in 1982 by the U.S. Mint in Philadelphia could be worth thousands of dollars each, writes Robert Higgs for cleveland.com.

These so-called No-P Dimes miss a small P that should have been shown to the right of the date. According to Jaime Hernandez, the price guide editor for the Professional Coin Grading Service, they represent the first business strike coins released in the U.S. which accidentally left out the intended mint mark.

Since the mint mark is missing, these coins are worth hundreds of times more than their face value of 10 cents.

A scale from MS-60 to MS-70 is used to grade coins. Those at the lower end may show worn marks or exhibit poor striking. Meanwhile, 70 represents a perfect coin with no visible blemishes.

Recently, an MS-66-graded example fetched the price of $300. The record sale took place in 2006, when a dime-graded MS-68 was sold for $2,185.

It is believed that a good number of No-P Dimes are still in circulation.

Read more about why as many as 150,000 dimes released in 1982 by the U.S. Mint in Philadelphia without a mint mark could be worth thousands of dollars at cleveland.com.

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