Pennies used to be over 90% copper with a little alloy to make it harder so it lasts longer. Now, they are famously 98% zinc, with just a copper coating.
I dont know exactly when nickels went to playing, but when I was looking at how to DIY home nickel-plating, I read that some guys are trying to find older Canadian nickels, which were almost pure nickel. Cheaper than buying new nickel for the plating process.
US dimes, quarters, and half-dollars from before the 1960’s were very high in silver. Of course now they are played. I have a couple of silver dollars from before WWII, and they contain one ounce of silver, but weigh 1.2 oz., because there is 0.2 oz of alloy to make them harder…
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