Those are mint marks where the coins were made. D stands for Denver. P stands for Philadelphia.
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D: minted in Denver. P: minted in Philadelphia.
If you mean 1979 quarters without mintmarks? 515,708,000 were released into circulation from the Philadelphia mint. 1980 was the first year a "P" mintmark was used on quarters.
It was minted in Philadelphia. Philadelphia quarters dated 1979 and earlier do not have a mint mark.
It means; Density equals pressure
All the Washington Quarters minted in the year 1989 carried a mint mark: "P," "S," or "D." The P and D minted coins are worth in MS60 condition: 75 cents; the S coin was minted only in proof and its value is: $3.00.