Nickel (United States coin)
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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 (21.21 mm) and its thickness is 0.077 inches (1.95 mm).
A 1796 half dime
Spencer M. Clark, Supervisor of the Currency Bureau, placed his own likeness on the five-cent U.S. Fractional currency note, leading directly to legislation prohibiting the depiction of any living person on U.S. currency.
NNC-US-1866-5C-Shield Nickel (rays)
Cupronickel
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Cupronickel or copper–nickel (CuNi) is an alloy of copper with nickel, usually along with small quantities of other elements added for strength, such as iron and manganese. The copper content typically varies from 60 to 90 percent.
Two stacks of Half dollars. The coins in the stack on the right are composed of cupronickel, and can be distinguished from the silver half dollars on the left by their visible copper cores.
Five Indian rupees, commemorating ILO
Twenty five Indonesian rupiah
Crack in 90–10 Cu–Ni metal plate due to stresses during silver brazing