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 Replies: 9 / Views: 1,258 |
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Valued Member
United States
214 Posts |
I was cherry picking a few memorial bank rolls and found this specimen. At first, it appears like a bubble lamination, and could be a dramatic version of this common occurance. The coin's obverse looks much more silver than in the pics. The color surrounding the date is an example of the color on most of the obverse. I have example pics from under the scope and the coin looks sand blast appearance on the reverse.     Edited by DoubleDie
06/24/2007 8:54 pm
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Pillar of the Community
United States
1952 Posts |
it looks like it was dug up . it is corrosion in any case and not a mint error. it has a bad case of the uglys lol
Gary too
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Pillar of the Community
United States
717 Posts |
What's with that Mint mark. RPM?
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Pillar of the Community
United States
7629 Posts |
The mintmark shows classic split plating. The copper split open when the coin was struck. Very common.
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Valued Member
 United States
214 Posts |
The coin has no corrosion. As I said, it came from a BU roll and has NO green or black that would indicate corrosion.
The pictures are decieving with the colors. I think the coin has a thin clad layer and some of the clad layer missing which reveals the zinc planchet.
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Bedrock of the Community
United States
12437 Posts |
First off- post-1982 cents(Zincolns) are plated, not clad. The first few years of the Zincolns were problematic. Most of the copper plating didnt take too well and it would bubble up on the surface. Also, the strike pressure would sometimes be enough stress to split the plating and expose the underlying zinc.
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Valued Member
United States
214 Posts |
Second off-cladding is still a metal covering a metal ,and the process of plating is different than cladding, but achieves similar results.
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Pillar of the Community
United States
7629 Posts |
Well, actually, clad and plated are very different from one another.
Clad is the process of sandwiching sheets of metal together and bonding them before they are cut into blanks.
Plating is the process of cutting blanks out of one metal then dipping the blanks into molten metal of another kind to bathe and coat the blanks.
Zinc cents are the latter and are not the former. It might be the case that clad and plated are similar in some machining processes or some other industry, but in numismatics they are VERY different and produce very different results. They also produce very different errors.
For instance, if the clad does not bond properly to one side of the sandwich but does the other, it is possible to create a dime or quarter that has copper on one side and the copper-nickel on the other. It's quite impossible to have a cent turn out perfectly unplated on one side and perfectly plated on the other side...they are dipped by the thousands into hot molten copper.
So...the process is different, the results are different, and the errors they produce are different. In fact there is NO similarity except that there is one metal covering another, and that both are used in manufacturing coins.
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Pillar of the Community
United States
7629 Posts |
Oh...and by the way, your coin is a common result of a problematic plating process used at least until 1988 by the US Mint. It involves a mix of improperly washed planchets, contaminated plating material, and plating at the wrong temperatures. Your coin has gas bubbles trapped underneath the copper plating that welled upward when the coin was struck. There are tons of these in circulation, and in fact are difficult to avoid completely in some issues, especially in D mint coins from 1983-1986. They seem nearly impossible to find without this effect to some minor degree.
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Valued Member
United States
214 Posts |
coppercoins, thanks for the info. However, you said the same thing I said in short.
...cladding is still a metal covering a metal ,and the process of plating is different than cladding, but achieves similar results.
The results that I'm referring to are that a coin is covered in metal over and/or around the base metal planchet.
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Replies: 9 / Views: 1,258 |
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Posted 06/25/2007 12:06 am
