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 Replies: 71 / Views: 12,304 |
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Pillar of the Community
United States
3463 Posts |
The SG test doesn't add up. It is possibly a cent struck on a foreign planchet. I think the last time the mint struck coins for other countries was in 1984. I'm not sure which, if any foreign coins were struck at US mints in 1983.
Do some research on that to see if there were any 2.1 gram, cent sized planchets in the mint during 1983 production.
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Pillar of the Community
 United States
1901 Posts |
Yeah I know it's a little low for copper and high for copper plated zinc I have done what you said and have come up with no results I'm wondering if it wasn't up to the specificationstore so maybe they put extra coat of copper causing it to be thick copper coating with less zinc core or the bronze mixture was a little off in mixture for the coin causing the low copper reading. but I agree with you it ain't adding up. Maybe I should get a xrf analysis to determine this
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Bedrock of the Community
United States
12477 Posts |
The only thing I found for foreign coins is the 1983 Panama centesimo minted in the U.S. but it is bronze and should weigh 3.1g. Quote:
maybe they put extra coat of copper causing it to be thick copper coating with less zinc core That's not a reasonable possibility considering how they are made. I still think it's a thin-planchet copper-plated zinc cent. I've never done an SG test so I can't really add anything there. I do have a question, though. If this were sent to say, ANACS, for grading/authentication with error designation, would they put "underweight planchet" or something similar on the label?  In Memory of Crazyb0 12-26-1951 to 7-27-2020
In Memory of Tootallious 3-31-1964 to 4-15-2020
In Memory of T-BOP 10-12-1949 to 1-19-2024
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Pillar of the Community
United States
1901 Posts |
 I am wondering the same thing. And how would I get almost copper penny SG results then? Would ANACS test it to be plated or solid? |
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Pillar of the Community
United States
1901 Posts |
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Pillar of the Community
United States
3463 Posts |
It could be a thin Zinc planchet plated with the normal thickness of Copper. That would explain the SG test, the lighter weight, and the weak strike.
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Pillar of the Community
United States
1901 Posts |
Could be. but is it worth sending in? I haven't found anyone around me that does xrf analysis.
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Pillar of the Community
United States
586 Posts |
Just a thought but in 1982 San Francisco minted 1.5 million cents with a composition of mostly zinc with a thin layer of copper for circulation without a mintmark. Could be a remnant of all that. https://www.NGCcoin.com/news/article/646/ |
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Pillar of the Community
United States
1901 Posts |
I don't know what it might be interested know the SG test is low for copper but high for zinc I don't know what the SG was of that penny you are talking about... I just need to find a place around me that will xrf test it and I will know for sure but have yet to find a place but I will
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Pillar of the Community
United States
1901 Posts |
Edited by Mrzllewellyn
09/22/2017 07:08 am
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Pillar of the Community
United States
586 Posts |
Labinc.com is a place in MO that can do a metallurgical analysis for you. (314) 531-8080 is the number. Also I was rummaging through some information and in 1982 the US made coinage for Panama' s 1/10 Balboa. It is 18mm and weighs 2.25 grams made from copper nickel clad copper. Close I thought
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Pillar of the Community
United States
1901 Posts |
Ok I will measure the coin and see if it's 18mm and 1.35mm not a little over 19mm
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Pillar of the Community
United States
1901 Posts |
It's 19.04mm by 1.17mm thick
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Bedrock of the Community
United States
17884 Posts |
Quote:
Also I was rummaging through some information and in 1982 the US made coinage for Panama' s 1/10 Balboa. It is 18mm and weighs 2.25 grams made from copper nickel clad copper. Close I thought We struck the Panama coins on the same planchets we used for our own coins. The 1/10th Balboa was struck on US clad dime planchets, nothing like the subject coin. |
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Pillar of the Community
United States
586 Posts |
Looks like you are correct Conder, as always Lol! I read a number of US planchet errors came from Panama and assumed because of the size and weight. Would you agree the .4 grams difference in weight is worth looking into? For a Lincoln Cent it seems unusual. Also, if it had a high zinc content it might explain the lack of definition in the coin strike...maybe |
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Replies: 71 / Views: 12,304 |
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Posted 09/18/2017 5:28 pm
