When did the Philadelphia Mint put a "P" on quarters?

Answer

Interesting question! They started putting the 'P' mint mark on quarters in 1979. Coins struck in the Philadelphia Mint before 1979 do not have mint marks.
Q&A Related to "When did the Philadelphia Mint put a "P" on..."
As far as the D, I believe it is 1932 which is when the Denver mint started making quarters. As far as P, I am not sure. I know that Philadelphia is the main U.S. mint factory but
http://answers.yahoo.com/question/index?qid=201002...
The Philadelphia Mint started adding a "P" mint mark to quarters in 1980. In previous years, quarters minted in Philadelphia had no mint mark at all. The mint mark can be
http://www.answerbag.co.uk/q_view/2002019
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