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Pillar of the Community
 United States
5780 Posts |
Quote:
... It looks like a normal cent and the weight is correct.
Why do you think it's an error? I thought the same thing but noticed the raised lines on the edge. I believe the OP is wondering if it might be reeding, which might be the reason for the title. This is PSD and may have been applied with a knurling tool. EDIT- I meant to add this image of one type of knurling tool wheel.  Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
Edited by Petespockets55
06/12/2023 10:59 am
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Forum Dad
United States
24170 Posts |
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Pillar of the Community
United States
4618 Posts |
Petespockets55... got it.
Even the edge seems normal to me. If it were reeding, it wouldn't have anything to do with the planchet. That's added by the retaining collar when the coin is struck.
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!! 
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Pillar of the Community
United States
5780 Posts |
Thanks Yoko.
This thread makes me wonder about the process to produce the zinc core (before plating).
Normal copper cents were punched from rolled sheets which might leave similar lines as the OP's coin.
I wonder if zinc would be processed by an upturning machine or if zinc would be too brittle to shape the same way (brittle according to Silviosi)?
Now I'm wondering if these lines on the edge might be on the zinc blank prior to plating with copper and might be evidence of the process used to put the proto-rim on the zinc planchets.
Does anyone know (for certain) how the proto-rim is formed on zinc planchets? Has anyone been to visit the Jarden Zinc plant in Greenville,Tenn.?
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
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Pillar of the Community
United States
4618 Posts |
Interesting! I wonder more that if the collar wasn't quite up to spec that it could be responsible for the look of the edge. Maybe the inside wasn't polished enough and was left rough. I think the striations were picked up from the collar, but it wasn't intentional. I would expect any anomaly on the edge of the planchet to be obliterated by the strike pressure and metal flow outwards against the collar.  ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
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Pillar of the Community
United States
573 Posts |
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Pillar of the Community
United States
5780 Posts |
I agree with you Yoko about the lines being obliterated by a normal pressure strike.
I thought this coin might be showing signs of a weak strike and the thin diameter (17.9mm) has me wondering.
It would be interesting to know if the lines encompass the whole perimeter or only part of it.
Thanks for that intel HGK. That's what I assumed as well but I've never heard anyone who has witnessed the creation of the proto-rim with zinc cents.
And my apologies to Clwang for taking her thread off topic.
Can you address Yokozuna's question please? "Why do you think it's an error?"
Or just give us more of your specific thoughts or questions.
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
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Pillar of the Community
 United States
8775 Posts |
Can you lay this coin on top of another Lincoln Cent and take a picture, straight on? I think the coin in question is of normal diameter for a cent. -makecents-
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Pillar of the Community
United States
5780 Posts |
Bump! CLwang, are you out there? Are you sure the diameter is 17.9 mm? That is slightly undersize even for a modern Lincoln Cent blank. Quote:
Can you address Yokozuna's question please? "Why do you think it's an error?" And Makescents suggestion of placing this coin on top of another for comparison. Trying to help you but we need a little input. Thanks. Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
Edited by Petespockets55
06/16/2023 06:43 am
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Moderator
United States
96936 Posts |
I think the collar cause the striations on this cent on a cent planchet. If there was a lack of lubrication, the collar could have become scratched while ejecting coins from it.
Also if it were a dime planchet - I would think we would see the copper core sandwiched between 2 cupronickel cladding layers here.
Edited by Dearborn
06/16/2023 8:34 pm
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Pillar of the Community
United States
5780 Posts |
Quote:
I think the collar cause the striations on this cent on a cent planchet... The problem with this thought is that the diameter of the coin in question is under size!! (17.9mm vs 19.00 mm) If the diameter truly is 17.9 mm, the coin never engaged the collar and these lines were on the blank. (This coin is not struck on a dime planchet or a foreign planchet but the lines on the edge are a curiosity.) Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
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Pillar of the Community
United States
6542 Posts |
If the cent is truly 17.9mm vs. 19mm, there is no reason to assume it could even make it through the upset mill correctly. You might be looking at the vertical shear marks from the sheet metal punch. However, if the cent is truly 17.9mm, then why is it 2.5g? It would need extra thickness to compensate. Even if it were accidentally cut from old pre-1982 copper stock, it would still be (17.9mm/19mm)*3.1g=2.92g, which it is not. The only coin I found that was struck at the US Mint around that date with 17.9mm, 2.5g was a Dominican Republic 10 Centavos coin. But that is 75Cu/25Ni and looks like a Jeff nickel metal, not like a copper anything. https://en.numista.com/catalogue/pieces3578.htmlIt could be something like a Bahamas cent or another foreign coin that was struck for fun, but that seems unlikely to escape containment. Also, if it were 17.9mm, wouldn't it be at least a little broadstruck? Even if the collar stopped the hammer from descending too far, the planchet would not be in contact with the collar walls. The tendency would be to get partly pancaked outwards by the strike, instead of the collar pressure forcing metal to move upwards to correctly form the devices and rim. Something doesn't add up here. |
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Pillar of the Community
United States
5780 Posts |
Quote:
... Something doesn't add up here. Exactly! It's very disappointing that the OP won't contribute to her own thread. Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
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Bedrock of the Community
United States
25398 Posts |
OP tosses out pics of "errors" on a regular basis, hoping for confirmation. Wisdom from @Earle42:  Inordinately fascinated by bits of metal with strange markings and figures
Edited by HondoB
06/16/2023 8:36 pm
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Moderator
United States
96936 Posts |
Something is definitely up here. What did the OP measure the coin with? A standard ruler or a Vernier caliper? I'm bringing into question the accuracy of the measurement here. If the op use a standard ruler, was it measured at the exact widest part of the cent? Is the cent slightly out of round? 1.1mm is not a huge difference in the larger scheme of things but it is enough. You see, the way I see it if the planchet did not contact the collar, then the rim would not strike up as well as it did. The rim needs the collar to contain it. Quote:
It's very disappointing that the OP won't contribute to her own thread. Yes it is, from what I have seen so far, is that the OP tosses out a coin with minimal information and leaves the rest up to us to figure out. Edited by Dearborn
06/16/2023 8:47 pm
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Replies: 17 / Views: 2,297 |
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Posted 06/12/2023 10:29 am
