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 Replies: 10 / Views: 1,600 |
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Valued Member
United States
83 Posts |
Edited by sonchild
08/23/2016 01:30 am
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Pillar of the Community
United States
5964 Posts |
Yours is farther from the building. It looks like a contact mark at the northwest and MD to the east. Best I can do with the picture provided.
Edited by CoinMasters
08/23/2016 01:29 am
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Pillar of the Community
United States
5964 Posts |
Edited by CoinMasters
08/23/2016 01:37 am
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Valued Member
 United States
83 Posts |
Sorry, I'll try to get a better photo. What is a rolling fin?
Edited by sonchild
08/23/2016 01:36 am
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Pillar of the Community
United States
5964 Posts |
A Rolling Fin is when there is excess metal protruding upward at the strike on the rim. I think it can be caused by excessive strike pressure. It is later flattened (rolled) through circulation.
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Valued Member
United States
83 Posts |
Sorry, these are the best I could take. I was experimenting between focal length and image size trying to get the largest image with it being in focus from the loupe lens. Not to mention I was shaking like a chihuahua.    Also, is a rolling fin common? I don't think I've ever seen this and I can't find any examples on Google or any explanation as to what it is. |
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Pillar of the Community
United States
5964 Posts |
Wow! those pics are a lot different from the first ones. I suppose the latest are the most accurate. I think you're going to need an expert Sonchild. I have to go now. Till tomorrow.
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Valued Member
United States
83 Posts |
Haha awesome, CoinMasters! Thank you very much for your input. I guess I'll wait for someone like Coop to come along.  |
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Bedrock of the Community
United States
62064 Posts |
I feel that the RPM posted are well placed contact marks on the mint mark. One mark on the top part and one on the lower part of the mint mark. On the last image posted you see a straight line.
1. The mint mark punch doesn't have a straight line on it horizontally. It is all curves. so when there is a RPM, you can't see a straight line unless it is on the left side of the mint mark. On the upper mark of the mint mark it is incuse. (this one may have happened after the strike with a coin dropping out of the machine onto the coin hitting the mint mark. note the pushed metal look on the lower hit)
2. A second clue that both marks are not part of the mint mark punch. The mint mark doesn't leave an incuse mark on the mint mark. Only damage will leave such a mark on the mint mark.
3. The third clue is that the overall shape of the mint mark is normal in size. On a RPM, they will be slightly enlarged especially when there is a large spread between the punchings. Just circulation damage on the mint mark.
4. The flattened fin is also the correct observation mentioned.
SO this one is not a RPM but damage on the mint mark. (two times which is unusual, but happens) and the circulation on the fin flattened it on the coin. (Possibly the fin got flattened the first time it was rolled into a tube) Just an educational piece to learn what can happen on a coin and one that can be released back into circulation.
When matching up RPMs it is best to look in the catalog the same year to match a RPM number. Often the mark on a RPM is very small on minor RPMs. (which rule out contact marks as they are blunt/not matching any part of the punch design)
Edited by coop
08/23/2016 06:19 am
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Valued Member
United States
83 Posts |
Struck out again. Thanks Coop.
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Pillar of the Community
United States
5964 Posts |
This coin may have struck out, but at least you learned something. An ace you can keep is better than a feather in your cap!  |
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Replies: 10 / Views: 1,600 |
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Posted 08/23/2016 01:33 am
