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 Replies: 16 / Views: 9,729 |
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Bedrock of the Community
United States
62064 Posts |
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Bedrock of the Community
United States
58726 Posts |
Good demonstration Coop! It was pretty easy to understand.  Errers and Varietys.
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Pillar of the Community
United States
1335 Posts |
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Pillar of the Community
 United States
6496 Posts |
 Thank You!
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Pillar of the Community
United States
987 Posts |
This is much appreciated!
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Pillar of the Community
United States
1694 Posts |
Very helpful post! Thanks.
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Pillar of the Community
United States
1494 Posts |
Thank you for the knowledge!
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Pillar of the Community
United States
751 Posts |
Will it also create a thin coin at the opposite side from the fin, or a weak strike on the same side as the fin ?
Dan
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Bedrock of the Community
 United States
62064 Posts |
I'm not sure on that, but that thought came by me when I created this thread. But if you look at a roll of tube cents, that would explain why so many are thinner on one side.
Edited by coop
02/09/2019 01:10 am
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Pillar of the Community
United States
2758 Posts |
Coop as always well explained cause and effect concerning rim fins. Adding more food for thought. After researching rim anomilies some time back. It seems I often see the Rim Fin and folded rin fin description misused for other causes showing a doubled (sometimes more) rim. I'm under the impression rim fins fall into the double and false rim category. Other causes can produce a somewhat similar effect. https://www.coinworld.com/news/us-c...tances.html#One effect thats kept me pondering is the collar clash. More specifically a die clash with a non reeded collar. When a reeded collar clash is present, its seems to be raised on the coin and visually evident. When a non-reeded collar clash is present it visually resembles a raised fin. You rarely if ever see collar clash mentioned when a non-reeded collar was in use. Unless major die attrition is evident its typically labeled a fin. Another thing to keep in mind is Wide Collar issues. This results in a larger than normal gap between the die(s) and collar as well. https://www.error-ref.com/wide-collar/Quote:
Will it also create a thin coin at the opposite side from the fin, or a weak strike on the same side as the fin ? When a coin seems abnormally thin or thick, I give it a bit more attention. US Cents are notorious for fluctuation in thickness. Modern day cents specs should be 1.52mm thick, but sometimes even the rolling of the stock material can fluctuate in thickness and show a difference from one edge to the other on the end product. Thanks, Doug. Edited by Halo1st
02/09/2019 5:09 pm
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Bedrock of the Community
United States
62064 Posts |
On the collar clashes, the die outer edge touches the collar. Leaving those lines on the die. When coins are struck, the damaged outside edge of the die leaves the lines on the rim area of the strike: https://www.error-ref.com/collar-clash/Check out the images a ways down. You can see the damage on the outside edge of the die |
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Pillar of the Community
United States
2758 Posts |
Edited by Halo1st
02/09/2019 8:43 pm
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Bedrock of the Community
United States
62064 Posts |
Edited by coop
02/09/2019 9:12 pm
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Pillar of the Community
United States
2758 Posts |
I eluded to die attrition in my previous reply. That seems to be a definitive collar issue regardless if it stems from a non-reeded collar or a reeded collar die wear issues. Some examples suggest a potential raised Rim Fin as well. What if a non-reeded collar clashed with a die occurred or was initiated prior to the major die attrition stage? To me it would seem to results in a raised impression along the periphery of the working dies design rim. Hence another potential looking Rim Fin. Thanks, Doug. Edited by Halo1st
02/09/2019 11:09 pm
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Moderator
 United States
162946 Posts |
Excellent tutorial! |
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New Member
United States
12 Posts |
Thanks, very informative description.
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Replies: 16 / Views: 9,729 |
Posted 02/07/2019 7:37 pm
