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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.
Five grams. The nickel was the first U.S. coin to have its weight expressed in round metric units, back in 1866.    Yes, efforts to break this country free of the â¦ ridiculous pound-foot-fortnight-bushel system of measurement have been going on for nearly 150 years.