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1913-1938 Buffalo Nickel Coin Guide. The Buffalo Nickel shared the same specifications as the prior series for the denomination. The composition consisted of 75% copper and 25% nickel. Each coin has a standard weight of 5 grams, or 77 grains, with a diameter of 21.2 mm. The edge of the coin is plain.
Actually most modern U.S. coins are almost entirely copper. Nickels are 75% copper; dimes, quarters, and halves are 92% copper, and dollars are 88.5% copper (source: U.S â¦. Mint). The only coin that's NOT mostly copper is the penny. Starting in mid-1982 the coin's composition was changed to a core of 97.5% zinc with a plating of 2.5% copper.