1982 Lincoln Memorial Cent / LMC Rim Trench - What Would Cause This?

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Author	Replies: 25 / Views: 2,671	Page: of 2
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/28/2015 4:41 pm I don't know that this could be called a rim Cud. There is a groove on the rim where the " Cud" ends. The groove gradually fades out as it proceeds CCW. Thoughts on what happened here? Edited by Pete2226 10/28/2015 7:54 pm Report this Post to the Staff

coop Bedrock of the Community United States 62064 Posts	Posted 10/28/2015 6:08 pm Rim Cuds are raised. http://www.error-ref.com/?s=rim+cud Report this Post to the Staff
tweak800 Pillar of the Community United States 1249 Posts	Posted 10/28/2015 6:21 pm I had a quarter with a weird hole in the rim almost just like that except well bigger and with less wear. and the fact it is on a quarter it made it a lot bigger and I never found an answer to it . I too posted on the forum here is my coin andyeah only one I have ever seen like it besides yours now. I would love to know the cause Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/28/2015 7:23 pm Quote: Rim Cuds are raised. Yes, I understand that! The feature to the right of the trench is raised...but appears to be only a part of the rim. So what is the explanation for the trench? Edited by Pete2226 10/28/2015 7:26 pm Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 10/28/2015 7:36 pm But it is not taller the normal rim. The trench is lower than the normal rim. Check the link and I posted and note how the rim Cud is a lot taller than the rim. Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/28/2015 7:44 pm Quote: But it is not taller the normal rim. The trench is lower than the normal rim. Check the link and I posted and note how the rim Cud is a lot taller than the rim. I understand that! What would be an explanation for the trench? Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 10/28/2015 8:57 pm Note sure. I used to think it was a flattened fin. but after checking the err-ref.com site I could not confirm anything for sure. Probably not damage as the zinc is not exposed. I also wondered it is was collar damage, but it would continue farther around the coin. So at this point I'm not sure. Nothing to add to a premium for this, but I would save it till you find out from Mike Diamond what this might be? Report this Post to the Staff
tweak800 Pillar of the Community United States 1249 Posts	Posted 10/28/2015 8:59 pm I will watch this till he answers HAHAHA mine is a little different but I'm guessing the same thing . I used to think it was struck through wire maybe but now that his is exactly the same IDK what it is. Report this Post to the Staff
CoinMasters Pillar of the Community United States 5964 Posts	Posted 10/29/2015 12:49 am While we're at it. Report this Post to the Staff
durkastani Valued Member United States 452 Posts	Posted 10/29/2015 05:55 am Yours might actually be a rim Cud CM. It looks pretty raised to me. Report this Post to the Staff
mikediamond Pillar of the Community United States 2736 Posts	Posted 10/29/2015 12:38 pm The "trench" most likely represents a flattened fin. I have no other ready explanation. Error coin writer and researcher. Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/29/2015 12:52 pm Thanks, Mike. Hard to visualize... Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/30/2015 10:24 am I have been trying to imagine what might have caused this trench on the rim. My current thinking is focusing on a defective planchet being fed into the upsetting mill. Maybe it was slightly out of round and lacking a small amount of metal volume in the area of the trench. While I don't exactly understand how. Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 10/30/2015 10:37 am The err-ref.com site mentions: Quote: Finning Definition: A fin is a thin flange that extends vertically from the rim/edge junction of a coin struck within the collar. It is caused by excessive striking pressure or a localized increase in striking pressure caused by slight die tilt. The extra pressure causes coin metal to squeeze into the narrow gap between die neck and collar. Fins can develop on either face or both faces simultaneously. A fin may encircle a coin or may be restricted to one pole. The latter is the kind typically produced by die tilt. Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/30/2015 2:44 pm Thanks, coop. That definition of fining really does not fit what is going on with this coin. This coin has a clear trench. There is no evidence even of a fold over Rim Fin in this area of the coin. There is missing metal where there should be a full rim. A Rim Fin at least adds a very small amount of metal to some portion of the rim. The only explanation I can think of seems to me to point towards the upsetting process and there not being enough metal to complete the rim in that section. That, in turn, points to some kind of planchet irregularity. It is as if the rim was never completely formed in this area. I can visualize the planchet having an elongated hollow tube along this area which causes it to take this shape during the upsetting milling process. Edited by Pete2226 10/30/2015 2:45 pm Report this Post to the Staff
CoinMasters Pillar of the Community United States 5964 Posts	Posted 10/30/2015 9:10 pm Sorry Pete, I shouldn't have posted my coin here. I think it's causing confusion. I'll know better next time. Report this Post to the Staff
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1982 LMC Rim Trench - What Would Cause This?