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mikediamond's Last 20 Posts
| Eisenhower Dollar 1976-1776 Crazy Stike Through Error-Please Advise
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mikediamond
Pillar of the Community
United States
2646 Posts |
 Posted 02/26/2025 10:37 pm
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| Lots going on here. An in-collar double strike (second strike with a partially deployed collar). The coin didn't move between strikes. However, the obverse die did move, creating a "one-sided" or "obverse-only" double strike. The reverse shows very strong machine doubling. There is, of course, a massive struck-through error on the obverse. I'm not sure why a Brazilian coin is in the mix. |
| | Forum: US Modern Variety and Error Coins |
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| Collectors' Clearinghouse On Pause (Permanently?)
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mikediamond
Pillar of the Community
United States
2646 Posts |
Posted 02/18/2025 2:33 pm
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| Thanks for your guidance, Brandmeister. One of the reasons I started this thread is to reassure people that my health is fine and that no catastrophe has befallen me. A lack of new columns could have been interpreted as a sign that I was undergoing cancer treatment or experiencing a similar ordeal. |
| | Forum: US Modern Variety and Error Coins |
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| Collectors' Clearinghouse On Pause (Permanently?)
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mikediamond
Pillar of the Community
United States
2646 Posts |
Posted 02/18/2025 08:16 am
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| Subscribers to Coin World may have noticed that for the past few months my Collectors' Clearinghouse column has been filled with old material. I stopped sending new material because Coin World had fallen 4 1/2 months behind in their payments to me. If they ever come up with my back pay, and promise to pay me promptly in the future, I will resume writing my column. If they don't, I can still take pride in a successful tenure of 16+ years. In the meantime, I'm open to any and all writing and consulting jobs that could make use of my skill set. |
| | Forum: US Modern Variety and Error Coins |
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| 1942 Brass Cent Valuation
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mikediamond
Pillar of the Community
United States
2646 Posts |
Posted 02/08/2025 10:41 am
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| Quite a few overweight cents (3.3 - 3.5 grams) with elevated levels of tin or zinc are known from 1941. A few carry the date 1942. The most prosaic explanation is that these planchets are derived from rolled-thick "brass" cent stock. I have about half a dozen in my collection. My average purchase price was around $50. |
| | Forum: US Modern Variety and Error Coins |
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| 1983 Planchet Error After Strike?
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mikediamond
Pillar of the Community
United States
2646 Posts |
Posted 11/28/2024 08:28 am
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| I suspect that this is post-strike damage, possibly a combination of chemical and mechanical damage. I don't like the way that the Memorial looks flattened in those areas where it hasn't been entirely erased. I don't like how the right lower steps are pitted. Some areas do look like a struck-through error, like where the N and E of ONE are abruptly interrupted. However, these can't compensate for the many signs of damage. |
| | Forum: US Modern Variety and Error Coins |
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| 1983-P Kennedy Half Dollar Is This An Error?
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mikediamond
Pillar of the Community
United States
2646 Posts |
Posted 10/30/2024 4:03 pm
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| I now have the coin. As best I can tell, a foreign body or contaminant was present in, or lying on top of, the core strip and was trapped between the core strip and the clad strip when the two were bonded together. As rolling proceeded, the foreign body disrupted the clad layer, exposing the core on either side of the foreign body. After rolling, the foreign body fell out of the strip, the blank, or the planchet, leaving a coarsely-textured groove in the coin's surface. |
| | Forum: US Modern Variety and Error Coins |
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| 1983-P Kennedy Half Dollar Is This An Error?
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mikediamond
Pillar of the Community
United States
2646 Posts |
Posted 10/21/2024 7:24 pm
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| As best I can tell, it looks like some kind of contaminant within the clad layer. I don't know if that contaminant is metallic. In any case, the presence of that contaminant either produced a gap in the clad layer or it led to some of the clad layer falling away before the strike. |
| | Forum: US Modern Variety and Error Coins |
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