The quarter, short for quarter dollar, is a United States coin worth 25 cents, one-quarter of a dollar. The coin sports the profile of George Washington on its obverse, and after 1998 its reverse design has changed frequently. It has been produced on and off since 1796 and consistently since 1831. It has a diameter of 0.955 inch (24.26 mm) and a thickness of 0.069 inch (1.75 mm). Its current version is composed of two layers of cupronickel (75% copper, 25% nickel) clad on a core of pure copper. With the cupronickel layers comprising 1/3 of total weight, the coin's overall composition is therefore 8.33% nickel, 91.67% copper. Its weight is 0.1823 troy oz. or 0.2000 avoirdupois oz. (5.670 grams). Designs before 1932 The choice of a quarter-dollar as a denomination, as opposed to the or the 20-cent piece that is more common elsewhere; it originated with the practice of dividing Spanish milled dollars into eight wedge-shaped segments, which gave rise to the name "piece of eight" for that coin. "Two bits" (that is, two eighths of a piece of eight) is a common nickname for a quarter. From 1796 the quarter was minted with 0.2377 oz. (6.739 g) of 89.24% fine silver (.2121 oz. [6.014 g] fine silver), revised to 90% fine silver from 1838 to 1964. It weighed 0.2357 oz. (6.682 g) from 1838, 0.2194 oz. (6.22 g) from 1853, and 0.2204 oz. (6.25 g) from 1873 to 1964. Six designs, five regular and one commemorative, have been issued until 1930: Draped Bust 1796–1807 Draped Bust, Small Eagle 1796 Draped Bust, Heraldic Eagle 1804–1807 Capped Bust 1815–1838 Capped Bust (Large Size), With Motto 1815–1828 Capped Bust (Small Size), No Motto 1831–1838 Seated Liberty 1838–1891 Seated Liberty, No Motto 1838–1865 Seated Liberty, With Motto 1866–1891 Barber 1892–1916 Isabella quarter commemorative 1893 Standing Liberty 1916–1930 Standing Liberty (Type 1) 1916–1917 (featured an image of Liberty with one of her breasts exposed) Standing Liberty (Type 2 or Type 2a) 1917–1924 Standing Liberty (Type 3 or Type 2b) 1925–1930 Washington quarter The original version of the Washington quarter issued from 1932 to 1998 was designed by sculptor John Flanagan. The obverse depicted George Washington facing left, with "Liberty" above the head, the date below, and "In God We Trust" in the left field. The reverse depicted an eagle with wings outspread perches on a bundle of arrows framed below by two olive