1986 D Lincoln Zinc Plating Missing

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Author	Replies: 24 / Views: 1,889	Page: of 2
trdhrdr007 Pillar of the Community United States 2335 Posts	Posted 02/17/2023 10:40 am Another one from the collection I just bought. When it was in the 2x2 I had my doubts about it. Looking at it in hand it appears to be a plating issue. Looking for other opinions. Report this Post to the Staff

Tacc Pillar of the Community United States 3535 Posts	Posted 02/17/2023 11:32 am I've never seen one of these, but first thing I think of is PMD, perhaps dipped in a corrosive which removed the copper layer. Report this Post to the Staff
silviosi Pillar of the Community Canada 6244 Posts	Posted 02/17/2023 11:59 am @Tacc Quote: perhaps dipped in a corrosive which removed the copper layer. Only Hydrochloric acid dissolve the Cu and in same time will attack the Zn. This it is a legitim missing plating. The strongest design struck show this. Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 02/17/2023 12:07 pm To me it looks altered. With it exposed this long, seems like the zinc rot would have advanced more that what we are seeing on this coin? Report this Post to the Staff
ijn1944 Bedrock of the Community United States 19159 Posts	Posted 02/17/2023 12:13 pm An accurate weight might tell us something. Report this Post to the Staff
robbudo Pillar of the Community United States 2757 Posts	Posted 02/17/2023 12:18 pm I really don't like the gradient between plated and non-plated sections at the top of the memorial on the right. This gradient is at the wavy portion where a chemical bath would variably effect the plating removal. I'm in the fake error camp. Report this Post to the Staff
trdhrdr007 Pillar of the Community United States 2335 Posts	Posted 02/17/2023 12:49 pm Weight is 2.51 grams. The coin was in the 2x2 and a binder page. The binder page was one of several stacked up in the bottom of a box. Not sure how much oxygen was getting to it to cause zinc rot. I assumed someone dipped it into an acid of some kind to eat the copper plating away. It seems to me that the dividing line would be straight across the coin if that were the case. It clearly curves on the obverse. Edited by trdhrdr007 02/17/2023 12:51 pm Report this Post to the Staff
HondoB Bedrock of the Community United States 25241 Posts	Posted 02/17/2023 12:53 pm This certainly appears to be a manufactured "error" produced by dipping in acid. Look at the strange waves to the right of Lincoln's bust, and the weakening of the reverse plating on "STATES OF AMERIC", especially the AM part. Inordinately fascinated by bits of metal with strange markings and figures Report this Post to the Staff
Dearborn Moderator United States 96209 Posts	Posted 02/17/2023 12:58 pm I agree too coincidental that both sides are missing the copper plating. Something dissolved the copper off while not harming the zinc Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
silviosi Pillar of the Community Canada 6244 Posts	Posted 02/17/2023 1:23 pm At 2.51 in the case of reproduction of the un-plated coin are two ways to be done: 1: reverse electro-plating in solution (very expensive lab components)or 2. very simply method to add zinc over the Cu (this is a boiling solution). This need laboratory equipment. Is hard for me to believe that will be done. An XRF on the Zn part could resolve the problem. Report this Post to the Staff
Tacc Pillar of the Community United States 3535 Posts	Posted 02/17/2023 1:57 pm Adding zinc back over the copper makes alot of sense! Report this Post to the Staff
CoinHI Pillar of the Community United States 2731 Posts	Posted 02/17/2023 2:05 pm There seems to be some luster remaining on the unplated portion of this cent leading me to believe it is a genuine error. Nice example if it is legit. "Pride is yoked with callous behavior, as humility is with compassion." St. Gregory Palamas Top Finds - 1969-S 1c FS-101 http://goccf.com/t/477681 1976 D WQ FS-101 http://goccf.com/t/382777 - 1968 D 1c FS-801 http://goccf.com/t/422254 Cool clashed dies - 1972 D 1c http://goccf.com/t/429855&SearchTerms=CCL Struck-In Rim Burr - 1969 S 1c http://goccf.com/t/425587&SearchTerms=burr Floating (Type II) Counterclash - 1978 D 1c http://goccf.com/t/434991&SearchTerms=1978 Report this Post to the Staff
Willburton Pillar of the Community United States 2558 Posts	Posted 02/17/2023 2:23 pm I agree if this is legitimate it is a one of a kind and awesome coin! But that does sound a little too good to be true. Report this Post to the Staff
Dearborn Moderator United States 96209 Posts	Posted 02/17/2023 2:26 pm If the copper was removed, you 'should' be able to feel the transition from existing copper down to the zinc layer. If zinc was added, just the opposite, there should be a transition up to the zinc from the copper layer. Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Edited by Dearborn 02/17/2023 2:27 pm Report this Post to the Staff
Danjor Valued Member United States 92 Posts	Posted 02/17/2023 4:13 pm Quote: I really don't like the gradient between plated and non-plated sections at the top of the memorial on the right. This gradient is at the wavy portion where a chemical bath would variably effect the plating removal. I'm in the fake error camp. The line would not be straight as the Liquid (acid?) would splash thus the WAVES and difference in color. I think if it was missing the copper layer the color would be even. Report this Post to the Staff
trdhrdr007 Pillar of the Community United States 2335 Posts	Posted 02/17/2023 4:59 pm Quote: The line would not be straight as the Liquid (acid?) would splash thus the WAVES and difference in color. That would only be true if the liquid was strong enough to rapidly dissolve the copper. If it took an extended amount of time the liquid would settle. Report this Post to the Staff
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