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 Replies: 20 / Views: 1,886 |
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Rest in Peace
United States
17900 Posts |
The 'crack' that you see is not indicative of zinc rot, although you are showing zinc rot beginning at 6:30 near the periphery and that is probably the main reason everyone advises a treatment which you've already performed.
In an earlier coin I'd say that almost looks like a fantastic die crack, but from 1984 I don't know of any die cracks even half that prominent, so it probably isn't that.
Perhaps someone more familiar with that early stage of zinc planchette use will be able to provide a better answer.
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Pillar of the Community
 United States
3331 Posts |
Quote:
In an earlier coin I'd say that almost looks like a fantastic die crack, but from 1984 I don't know of any die cracks even half that prominent, so it probably isn't that. At first, I thought it might be a die crack, but did not understand what was happening between it and the rim. I looked at a "Lamination Crack", but that did not quite seem to fit either. The area towards the rim is definitely raised and appears to be peeling away from the surface in places...  Edited by Pete2226
07/08/2015 11:56 am
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Pillar of the Community
United States
6478 Posts |
The important thing to remember about zincs is that they can't LAM.
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Pillar of the Community
United States
3331 Posts |
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The important thing to remember about zincs is that they can't LAM. Okay - thanks for that! I either did not know that or my old age and senility combined to erase it from my memory!  I am noticing that this feature appears to go over the tops of the letters. What might that mean? Does it mean it existed on the planchet before the strike? |
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Bedrock of the Community
United States
62064 Posts |
Looks more like split plating on most areas. On the Motto, can see see under that area. I was wondering if it was struck through foil in that area. If so it would peel upwards. But it if is attacked, then a plating crack. in that area.
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Pillar of the Community
United States
3331 Posts |
I am finding it a bit difficult to take a photo of the area viewing it at an angle. Here is the best I seem to be able to provide:  |
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Bedrock of the Community
United States
62064 Posts |
If you an see any gray in that area, it is plating crack/splitting. If you see no gray and if areas are peeling upwards, then it maybe a struck through foil issue. If you see on the outside edge a starting and ending point if may be a struck through foil.(or possible die crack but they usually don't happen in this area)
Edited by coop
07/08/2015 1:00 pm
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Pillar of the Community
United States
3331 Posts |
No gray showing. The area is definitely higher than the field but not peeling in the sense that it looks like I could insert a pin under it. The edge which looks similar to a crack has a kind of "rolled" appearance sort of like the "rolled" appearance on the end of a bank coin roll - only smaller. That edge is higher than the field and also higher than the area between it and the rim. That area towards the rim also appears higher than the field.
The coin weighs 2.53 g.
Edited by Pete2226
07/08/2015 1:11 pm
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Pillar of the Community
United States
3331 Posts |
Quote:
But it if is attacked, then a plating crack. in that area. I have been searching for a photo of a "plating crack". So far I haven't found a photo of one. Does anyone have a link to such a photo? |
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Valued Member
United States
241 Posts |
Interesting. Why is the that zincs can't LAM?
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Pillar of the Community
United States
6478 Posts |
The zinc is PURE. Impurities in the alloy of copper cents and other alloys causes them to lam.
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Valued Member
United States
241 Posts |
Didn't know that. Thanks.
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Pillar of the Community
United States
3331 Posts |
I wonder if anyone can tell me how you recognize when a crack is a plating crack or when it is a die crack?
Would a plating crack have zinc visible along it?
Does anyone know where there are some photos of plating cracks?
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Pillar of the Community
United States
6478 Posts |
Edited by SilverStackerKid
07/09/2015 1:57 pm
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Pillar of the Community
United States
3331 Posts |
Thanks, SSK - those are good to know about, but it seems they are talking about split plate, not a plating crack. I have never heard of a "plating crack" until this discussion. I have been unable to find anything on it with an internet search...hence my question. It is fairly clear to me that I am not looking at some form of split plating with this coin, since no zinc is visible along the crack. That is why I am looking for more information about a plating crack. Of course, perhaps the original use of the term meant "split plating" instead!
I am just about to decide that what I am dealing with here is a die crack - even though they are seldom, if ever, seen in this location!
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Posted 07/08/2015 11:04 am
