Nickel
United States coin
A nickel is a five-cent coin struck by the United States Mint. Composed of cupronickel, the piece has been issued since 1866. Its diameter is 0.835 inches and its thickness is 0.077 inches.
The silver half dime, equal to five cents, was issued... Wikipedia
Person: Thomas Jefferson
Composition: 25% nickel; 75% copper; "War Nickels" (mid-1942 to 1945):: 56% copper; 35% silver; 9% manganese
Diameter: 21.21 mm (0.835 in) except Shield nickels (1866–1883) 20.5 mm (0.807 in)
Edge: smooth
Silver: 1942 to 1945 Wartime Nickels only (with large mint mark on reverse) 1.750 g 0.05626 troy oz
Thickness: Not specified for Shield nickels. All others: 1.95 mm
Value: 0.05 U.S. dollar