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By late 1982 all cents were supposed to be struck in copper-plated zinc instead of solid copper (actually bronze) but there is some suspicion that a bit of leftover copper stock was accidentally used to mint some 1983 cents. However at this point there are no confirmed reports.

This is called a "transitional error" and sometimes happens when a design or composition change occurs, especially when 2 types of coins are being minted at the same time. The Mint is a lot like a large factory, and slip-ups do occasionally happen in spite of very strong controls.

Some of the more famous transitional errors have been:

> 1943 cents struck in copper left over from 1942. instead of wartime steel

> 1944 cents struck in steel left over from 1943

> 1999 SBA dollars struck on gold-colored Sacagawea blanks

> 2000 Sacagawea dollars struck on cupro-nickel SBA blanks

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17y ago

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They all contain some copper, but the amount depends on when it was made. Those minted before 1982 were 95% copper with 5% zinc, while those minted since then are 97.5% zinc with only 2.5% copper.


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