The Quarter Dollar is a United States coin worth 25 cents. It has been produced on and off since 1796 and consistently since 1831.
From its inception until 1964, the denomination was issued in silver; it underwent several design changes, including finally the silver Washington quarter (1932 - 1964) featuring the first President of the United States on the obverse and the American Eagle clutching a bunch of arrows on the reverse. Initially meant as a one-year design to commemorate 200 years since the birth of George Washington in 1932, the obverse became the definitive design for the denomination and has been used ever since. The reverse was issued in this form until 1998, after which time the series of "State Quarters" circulating commemoratives started being issued instead.
The 50 State Quarters Program was a ten-year initiative started to support a new generation of coin collectors, and it became the most successful numismatic program in history with roughly half of the US population collecting the coins, either in a casual manner or as a serious pursuit. Between 1999 and 2008, the United States Mint issued five different "state quarters" every year, each dedicated to one of the US states, in the order of their entrance into statehood. In order to accommodate the reverse designs better, some of the wording which was previously on the reverse was transferred to the obverse. This was done by Mint sculptor-engrave William Cousins, whose initials were added to those of the original designer John Flanagan on the truncation of George Washington's neck.
The South Dakota quarter is the 40th coin released in the 50 State Quarters Program and the fifth for 2006; it was released on 28 August 2006.
South Dakota, admitted in the Union on 2 November 1889, themed the coin "Mount Rushmore and Pheasant". The reverse was designed by Michael Leidel and engraved by John Mercanti.
South Dakota State Quarter Dollars issued in 2006 have now been in circulation for 18 years. | 
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