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1970-S LMC "Rim Spikes"? Calling them that because I have no idea?  
 

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 Posted 12/27/2016  9:10 pm  Show Profile   Bookmark this reply Add mikediamond to your friends list Get a Link to this Reply
I agree that these are die dents, but I don't know what caused them. Such is the case with most forms of die damage.
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 Posted 12/27/2016  11:44 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
Keep in mind these die dents are really very small. Were are looking the the coins with a microscope. So even a slight bit of contact of the die, would look huge on a coin. (because we use a scope to see it)
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Edited by coop
12/28/2016 09:54 am
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 Posted 12/28/2016  06:35 am  Show Profile   Bookmark this reply Add 11997755 to your friends list Get a Link to this Reply
Thanks for mentioning that coop. They really are very small. Tend to overlook that part of it cause I'm so used to seeing the dents under a scope.
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 Posted 12/28/2016  07:53 am  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
Maybe we are

Take a look at the last image here and see the discussion:
http://koinpro.tripod.com/Articles/...ieGouges.htm
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 Posted 12/28/2016  4:21 pm  Show Profile   Bookmark this reply Add 11997755 to your friends list Get a Link to this Reply
Thanks for the link Pete. Sure does look like what we are seeing.
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 Posted 01/06/2017  05:19 am  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
I just saw another set of these marks show up on another forum. I am inclined to think that Ken Potter is correct in saying that there is no point in pursuing the question about their cause, but every time I see them my curiosity gets the best of me!

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 Posted 01/06/2017  1:30 pm  Show Profile   Bookmark this reply Add Dustin6 to your friends list Get a Link to this Reply
Pete, same here, HMMMMM I want to keep going!! But I just cant!
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 Posted 02/17/2017  10:39 am  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
I can't help it! I keep returning to this question!

I am working on a hypothesis concerning how these die dents happen. If anyone is able to help me by providing comments, photos, or videos, I would be grateful!

I contacted the US Mint and have received a response. They don’t know! (Surprise!) However, they did offer a list of possibilities. One of their most interesting possibilities of where or when this could happen is during the die installation and/or servicing process.

I am thinking that one of the tools with a high probability of causing these dents is a Die Setter Pry Bar. Here is a photo of some Pry Bars:



I have also found some photos of the assembling of die tool kits.






Edited by Pete2226
02/17/2017 2:01 pm
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 Posted 02/17/2017  11:15 am  Show Profile   Bookmark this reply Add Halo1st to your friends list Get a Link to this Reply

Quote:
In my mind a die is just one piece of many that make up for the tooling or toolset process. Remember the mint is a manufacturing or production plant that just happens to manufacture dies to produce the end product coins. The die itself after creation I'm sure is handled more times than we might think. Can go from creation to QC, then to production, then to the tool setter, then to the machine operator.


The last image shows what I was referring to earlier. The die is just one piece of the tooling or toolset. I get the impression some might think the dies are popped in and out of the machine like a bit used in a cordless drill, when in fact theres a little more involved in setting up for a machining process. Thanks, Doug.
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Edited by Halo1st
02/17/2017 11:16 am
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 Posted 02/17/2017  2:33 pm  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
Thanks, Doug.

I found this video of a Die Setter preparing a die.

At 31 seconds into the video is a place where a slight movement to the side could leave this kind of dent on the die.

U9zHQyB_W_g
Edited by Pete2226
02/17/2017 4:14 pm
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 Posted 02/17/2017  3:07 pm  Show Profile   Bookmark this reply Add cwb to your friends list Get a Link to this Reply
I saw that video too, but the dents we are seeing are more like lines, they have two straight sides. A dent from something like that would leave a beveled mark.
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 Posted 02/17/2017  3:50 pm  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
The dent on the coin in the OP has one obvious straight side.The other side seems to fade away. I still think it is possible that this dent could be made by the action of placing the collar (that is the collar, isn't it?). I have an image of the underside of that collar, which would be the portion to come into contact with the coin die. It is what seems like a circumferential ridge which would make contact. (See the white arrow on this image). Seems to me that it is very close to a "fit". There is room to maneuver the collar a bit before that portion reaches the die surface. It would not take but a slight movement for it to drop slightly off center.




Edited by Pete2226
02/17/2017 4:17 pm
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 Posted 03/16/2017  10:10 am  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
This appears to be another similar gouge - but a bit away from the rim. I winder what kind of set up they had in 1919 in terms of feeder fingers, and etc.









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