under tail feathers of eagle
Today quarters are made in three mints: the Philadelphia mint, the Denver mint and the San Fransisco mint. The Philadelphia mint and Denver mint produce quarters for circulation, while the San Fransisco mint makes proof quarters for collectors.
The US Mint in Philadelphia struck .............613,792,000 quarters in 1990. The US Mint in Denver struck .....................927,638,181 quarters in 1990. The US Mint in San Francisco struck ...............3,299,559 proof quarters in 1990. Total number of quarters struck in 1990: ..930,938,353
US Quarters minted in 1954 bear both the mint mark of San Francisco, California mint "S" and the mint mark of the Denver, Colorado mint "D". Additionally, the US Mint at Philadelphia, Pensylvania also struck these quarters but no mint mark was used.
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.
The letter on quarters represents which mint facility produced the coin. "P" stands for Philadelphia Mint and "D" stands for Denver Mint. These marks help identify where the coin was minted.
at the US mint
These quarters were made at 3 US mint facilities- Philadelphia, Denver, and San Francisco. The Philadelphia mint made these for circulation and these don't have a mint mark. The Denver mint marked with a "D" also made them for circulation. The San Francisco mint marked with a "S" made special coins called proofs. These were sold to collectors and investors.
According to the US mint, 568.01 million quarters were made in 2012.
No mint marking
The US did not mint regular issue quarters in 1975. Bicentennial quarters were made instead.
D represents the Denver Mint. It's not just limited to quarters or even silver quarters. All coins minted in Denver have a D mint mark.
Here are the production figures for circulating 2011 quarters: Denver mint: 195 million Philadelphia mint: 196.2 million Total made: 391.2 million