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| Cent (United States) | |
| Value: | 0.01 US dollars |
| Mass: | 2.5 g |
| Diameter: | 19.05 mm |
| Thickness: | 1.55 mm |
| Edge: | plain |
| Composition: | Copper-plated Zinc 97.5% Zn, 2.5% Cu |
| Obverse | |
| Design: | Abraham Lincoln |
| Designer: | 1909 |
| Reverse | |
| Design: | Lincoln Memorial |
| Designer: | 1959 |
The United States one-cent coin, commonly called a penny, is a unit of currency equaling one 1/100 of a United States dollar. Its obverse has featured the profile of President Abraham Lincoln since 1909, the centennial of his birth. Since 1959 (the sesquicentennial of Lincoln's birth), the reverse has featured the Lincoln Memorial.
Despite the prevalence of the common term "penny", the U.S. Mint has never actually minted a coin for which this is the official name.
| 1982-present | 97.5% zinc, 2.5% copper |
| 1962-1981 | 95% copper, 5% zinc |
| 1944-1961 | bronze (95% copper, 5% zinc and tin) |
| 1943 | zinc-plated steel |
| 1864-1942 | bronze |
| 1857-1863 | 88% copper, 12% nickel (a.k.a. NS-12) |
| 1837-1856 | bronze |
| 1793-1836 | copper |
The cent's composition was changed in 1982 because the value of the copper in the coin started to rise above one cent. In 1943, at the peak of the Second World War, pennies of zinc-plated steel were made for a short time due to war demands for copper; a few (the U.S. Mint reports forty) copper cents from 1943 were produced. Following that year, salvaged ammunition shells made their way into the minting process, and it was not uncommon to see coins featuring streaks of brass or having a considerably darker finish than other issues.
The cent has gone through several designs over its two-hundred year history. Until 1857 it was about the size of the current United States half dollar coin.
The following types of cents have been produced: