U.S Nickel coin introduction(2010.04.28)

The nickel is a five-cent coin, representing a unit of currency equaling one-twentieth, or five hundredths, of one United States dollar.

The nickel's design since 1938 has featured a profile of President Thomas Jefferson on the obverse. From 1938 to 2003, Monticello was featured on the reverse. For 2004 and 2005, nickels featured new designs to commemorate the bicentennials of the Louisiana Purchase and the Lewis and Clark Expedition; these new designs were called the Westward Journey nickel series. In 2006, Monticello returned to the reverse, while a new image of Jefferson facing forward was featured on the obverse

Nickel
Value 0.05 U.S. dollar
Mass 5.000 g  (0.1615 troy oz)
Diameter 21.21 mm  (0.835 in)
Thickness 1.95 mm  (0.077 in)
Edge Plain
Composition 75% Copper
25% Nickel

"Wartime Nickels" (mid-1942 to 1945)
56% Copper
35% Silver
9% Manganese
Years of minting 1866 – present (except 1922, 1932, and 1933)
Catalog number -
Obverse
Obverse
Design Thomas Jefferson
Designer Donna Weaver
Design date 2006
Reverse
Reverse 
Design Louisiana Purchase/Monticello
Designer -/Felix Schlag
Design date -/1938