1991 Quarter Mint Mark Error

If 1991 Quarters only have D or S mint Marks, then why does mine have a P.
The ones made in Philadelphia have no mint mark.

I wonder if they accidently made used a P and then tried to repeat and then do
a D ? What do you think ? Is it a double mint mark that now looks like a P?

thank you.

 

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No ma'am, you're probably thinking of cents. Only the 2017 cent bore the P mint mark.

 

All Philadelphia Nickels, Dimes, Quarters and Half Dollars minted 1980-Present bear a "P" mintmark.

 

I think only the cents leave the P off the coin. 2017 is the only Abe with a mint mark. Oops. After 1967 we started seeing mint P marks on other coins such as nickels and above. Oops again. What @Mr. Numismatist said. I was no help.

 

thank you

 

The Philadelphia mint stills uses the P mint mark today.