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The predominantly zinc coins make a lower-pitched "clunk" when hitting the surface, and make no sound when flipped in the air; while the copper coins produce a higher-pitched ringing sound. [8] In addition, a full 50-cent roll of pre-1982/3 coins weighs 5.4 oz (150 g) compared to a post-1982–83 roll which weighs 4.4 oz (120 g).
Currently, pennies are 97.5% zinc and 2.5% copper, and at ... As a result, with only a few wartime exceptions, any penny from 1981 or earlier -- and some made in 1982 -- have a high copper content.
Originally struck in 95% copper, the cent coin was changed for one year to zinc-coated steel in 1943 as copper was needed to aid in the war effort. The mint then reverted to 95% copper until 1982, when inflation made copper too expensive and the composition was changed to zinc with an outer copper layer.
The mass and composition of the cent changed to the current copper-plated zinc core in 1982. Both types were minted in 1982 with no distinguishing mark. Cents minted in 1943 were struck on planchets punched from zinc-coated steel which left the resulting edges uncoated.
Most pennies minted since mid-1982 are struck on planchets made up of a solid zinc core with only a trace of copper. This is what $26,000 coin should have been struck on.
Second, it was not supposed to be minted with copper in 1982, but there were “leftover copper planchets” that the U.S. Mint struck with zinc to create the error, according to CoinValue. Prices ...