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1935 and before : 90% silver, 10% copper

1971-81 and 1999 : copper-nickel "sandwich" metal, like dimes and quarters. The outer layers are 25% nickel and 75% copper and the core is pure copper for an overall composition of 8.33% nickel and the rest 91.67% copper.

2000 and later : manganese brass bonded to a pure copper core. The outer layers are composed of 77% copper, 12% zinc, 7% manganese, and 4% nickel.

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