The Quarter Dollar is a United States coin worth 25 cents. It has been produced on and off since 1796 and consistently since 1831.
After the initial issue of the "Draped Bust" type (1796 - 1807), a Capped Bust obverse was used until 1838, and then the Seated Liberty type design from 1838 to 1891.
In 1892, this new design was introduced; it is known as Barber coinage (together with the dime and half dollar which were re-designed at the same time) after U.S. Mint Chief Engraver Charles E. Barber who developed it, or Liberty Head after the portrait of Miss Liberty on the obverse which only shows her face, unlike the earlier designs. The reverse is similar to that of the Draped Bust Quarter and displays an ornate American Heraldic Eagle.
The Barber Quarter was only issued until 1916, when it was replaced by the "Standing Liberty Quarter". Its composition, like that of earlier quarters, is 90% silver and 10% copper. In later years, the denomination also underwent changes in size and composition (the quarter is now lighter and made of copper-nickel), but these coins have never been demonetised and are still legal tender. This, of course, is of academic interest only, as their numismatic value is enormously higher than their face value.