1990-D Kennedy Half Dollar / KHD Lamination Error? Die Break? PMD? Acid? (Coin 20200208-001)

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Author	Replies: 4 / Views: 1,184
chrisof4 Valued Member United States 274 Posts	Posted 02/08/2020 7:44 pm Found this one while CRH and looking for input on what caused this. The dark part is lower than the rest of the coin. My initial thought is acid or some other corrosive substance ate away the metal, but the devices don't show the level of deterioration I would expect if that was true. There appears to be a die break running along the eagle's left leg. I dipped this in acetone to remove any as much crud as possible, but it did not make much difference. All input is welcome. Thanks! Report this Post to the Staff

John1 Moderator United States 56855 Posts	Posted 02/08/2020 8:02 pm To me it looks like a stain on the coin. John1 Report this Post to the Staff
chrisof4 Valued Member United States 274 Posts	Posted 02/08/2020 8:54 pm I agree, but if it is just a stain I don't understand is why the stained area is recessed? Report this Post to the Staff
John1 Moderator United States 56855 Posts	Posted 02/09/2020 04:17 am If recessed, then the liquid would have been acidic to eat away at the nickel. It ate the top part of the nickel layer,but not deep enough to show copper? John1 Report this Post to the Staff
chrisof4 Valued Member United States 274 Posts	Posted 02/09/2020 11:31 am Yeah, that makes sense, John. Thanks for the input! Report this Post to the Staff
	Replies: 4 / Views: 1,184

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1990-D KHD Lamination Error? Die Break? PMD? Acid? (Coin 20200208-001)