(4) 1971-D Kennedy Half Dollar Error Coin Silver Planchet

You are correct.. the 64 JFK

 

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There is 90% silver in which the silver is homogeneous or mixed completely in the coin metal. The silver content of the coin is 90% of the total volume of the coin.

Then there is 40% silver which is a 80% silver and 20% copper outer layer clad to a inner layer containing 79% copper and 21% silver, thus in total, the coin consisted of 40% silver. The ions of the silver in the outer layer will migrate to the exposed 79% copper core at the edge, giving that copper core a grayish tint. You can see that in the photo you posted. If you rub the edge of a 40% coin on a jean pants leg or similar cloth, it will remove the silver film on the copper layer and it will show copper the same as a nickel clad coin.

 

Thanks so much! Not doubting at all! Just puzzled on the 4 weigh so differently from the others. I read more about it. Thanks again.