How many troy ounces of silver is there in American silver coins?

I would like to know how many troy ounces of silver are in any coins pre-dating 1964.

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2012 AMERICAN SILVER EAGLE PERFECT MS/BU 1 TROY OZ .999 FINE US COIN BULLION

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  3 x 1 oz American Silver Eagle Coin 2012 - One Troy oz .999 Bullion $121.50 33m

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