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Replies: 35 / Views: 3,973 |
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Pillar of the Community
 United States
844 Posts |
coop, I understand your thinking on this one. I'm just not so sure about PMD. As mentioned before, I've seen this on other coins (along with harrison2) and it appears in the same spot on each one. Would you like me to send it to you and you can better see it for a diagnosis? I hate to disagree with an expert, but in this case I have to based on seeing this coin in person and the above mentioned reasons. Please don't be offended about that coop. I would be willing to send it to you for examination. Just let me know!
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Bedrock of the Community
United States
62064 Posts |
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Pillar of the Community
United States
601 Posts |
What about this- I've noticed this on nickels often enough too. I believe that the natural forces of the pressure on the die cause a weak area on this portion of the reverse die. On both the obverse and reverse metal gets forced into the deeper devices of the Monticello and Jefferson. BUT- the area in question actually pushes this metal, being a high point on the die.
Does this make any sense? I gave a lot of thought to what occurs when a chunk of steel molds coins many thousands of times, as stated earlier, I believe this is a type of erosion doubling.
There are many informed people in this thread, and I too am not insisting I'm absolutely correct. Just offering a theory and the thought behind it. Curious to see if anyone follows my logic.....
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Pillar of the Community
 United States
844 Posts |
It would be nice to find a site that gives a detailed explanation of how the minting process works. I've looked around and still haven't gotten the complete story. You may be on to something there liveandievarieties. I just don't know enough about the process. I'm glad too that you have noticed the same.
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Pillar of the Community
United States
601 Posts |
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Pillar of the Community
 United States
844 Posts |
Awesome information on the minting process! Why wasn't it made a sticky thread? More people could really benefit from this. I'm going to print those off for future reference!
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Pillar of the Community
United States
601 Posts |
I love that some people here are truly hungry for knowledge!
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Pillar of the Community
United States
4000 Posts |
Jaymon, your post above is what prompted me to bring those up again. I was afraid if I just put it here, you'd be the only who seen it.
We have enough new members that I felt it was warranted to bring up again.
The first time I brought it up, I also voted for it to be a sticky.
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Pillar of the Community
United States
601 Posts |
This is an excerpt from a thread by well known authority, BJ Neff. In it he describes what I believe is the same phenomenon. He has worded it better than I was able to convey, though it's the same principle. He's referring to a cent in this case, but we can assume that the same occurs with on the nickel dies.
"This is a bleed through of a design element. It occurs at during the later stages of the die, when after continuous striking of planchets, the force from the hammer die is transferred through the planchet and onto the anvil die. This creates a die dent on the anvil die, in this case, the out line of Lincoln's bust. One big clue in detecting this anomaly is that there is no corresponding die clash marks on the hammer die. The reason why is that the force generated from the hammer die strike is downward, through the planchet and anvil die, where it is dissipated into the base where the anvil die sits."
This makes perfect sense to me, anyone else?
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Pillar of the Community
 United States
844 Posts |
Liveandievarities, Ok, I don't understand the part about a "die dent on the anvil die" wouldn't that leave a raised area on the said coin instead of a "crease" ? I reread the minting process and didn't see mention of the "anvil die". Maybe I just missed it cause I'm tired? Forgive me, I'm still new to the minting Knowledge! By the way, much to my wife's dismay, I do want to learn as much as I can about errors, varieties and everything in between!
Scooby Due, I'm glad that you did! I'll have to read it a few more times to absorb the information, but I'll get it. Thanks again!
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Pillar of the Community
United States
4000 Posts |
Interesting excerpt by BJ.
But, the area in question is almost all field on field. The die dent from relentess striking does make sense, but this doesn't seem to be a design element bleeding through.
I'm certainly not arguing with him, just more food for thought.
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Pillar of the Community
United States
601 Posts |
And I'm certainly not insisting I'm right, nor that his explanation pertains, but it makes sense to me. Not so much a design element bleeding through, but a stress point anvil die.
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Bedrock of the Community
United States
62064 Posts |
Jason: You came came to me today. And guess what? It is something different than all have imagined as to what caused it. Some thoght it was damage. Some thought it was a clash. Some didn't know. But after looking at the coin, I've figured it out. The mark that appeared to be a crease is really the surface of the normal die. The area to the right of it was removed to remove a clash. They used something that took a wider swath than what we figured be necessary. In other words they abraided the die in the area to the right of the crease and all coin after that would have now a raised area. I have images that may help to see what happened:  This shows the area that was abraded circled and the crease is present.   This is the area where the concentrated polishing took place. Hope this helps.
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Pillar of the Community
 United States
844 Posts |
Awesome! So I was right to say not PMD? That may be a first for me on here! (being correct) Great explanation of how it happened also. Ok. Here's another question. Would this be considered a variation then? It was a modified die correct? It was modified and then continued production so they knew about it. That would make it a variation instead of an error?
Edited by Jaymon74 03/25/2011 8:31 pm
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Bedrock of the Community
United States
62064 Posts |
It is just a worked over die. Just a phase that most dies go through. Now we know what caused it. It fills in a new chapter in what happens to dies and why. Thanks for sending it to me. It's headed back your way tomorrow.
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Replies: 35 / Views: 3,973 |