The new silver quarters entered circulation on August 1, 1932; and continued to be struck in silver until the Mint transitioned to copper-nickel clad coinage in 1965. A special reverse commemorating the United States Bicentennial was used in 1975 and 1976, with all pieces bearing the double date 1776–1976; there are no 1975-dated quarters. Since 1999, the original eagle reverse has not been used; instead that side of the quarter has commemorated the 50 states, the nation's other jurisdictions, and National Park Service sites—the last as part of the America the Beautiful Quarters series, which continued until 2021. The bust of Washington was modified and made smaller beginning in 1999; in 2010 the original bust was restored (though still small) to bring out greater detail. In 2021, Flanagan's original design resumed its place on the obverse, with a design showing Washington crossing the Delaware River in 1776 for the reverse, while in 2022 a new commemorative series depicting women of the states and territories will commence.