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2922 D Wilma Mankiller Improperly Annealed Quarter

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Pillar of the Community
United States
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 Posted 08/23/2022  8:15 pm  Show Profile   Bookmark this reply Add RW1010 to your friends list Get a Link to this Reply
Thanks SamCoin. Here's a better view of the reeding
2922-D-Wilma-Mankiller-Improperly-Annealed-Quarter
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silviosi's Avatar
Canada
6244 Posts
 Posted 08/23/2022  8:31 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
Look Man, this it is annealing. I do not know what you say about end of the strip grain?!!!?. Who come and wrote this? Holly Molly.
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 Posted 08/23/2022  9:12 pm  Show Profile   Bookmark this reply Add RW1010 to your friends list Get a Link to this Reply
Not from the end but the striations that are on the interior layers before being cold rolled. When overheated they could appear on the surface of the coin to make striation lines. Maybe
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silviosi's Avatar
Canada
6244 Posts
 Posted 08/23/2022  9:52 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
Sorry do not exist MAYBE in science. If who wrote this it is 3 (triple) Nobel Price in 1. metallurgy, 2. Physics of materials and 3. Molecular Physics and Chemistry, I will accept. This theorems do not exist. This it is just a science-fiction of someone.

First, the cladding is say cold because the materials are not heat enough to reach theirs half temperature from the melting point. The rolls are in general at 100 deg. C and due to the 8 to 12 tones rolling apply, the core will develop mere energy which is transformed in heat (thermal energy) and the Cu molecules from the Ni-Cu alloy can mixt with the Cu molecules of the core. The core rolls are polish after are rolled. So no strides or maybe some Micronics ones..

Outside rolls of the cladding develop strides due to the high friction, heat and strength of the material if are not well oiled.

So you have here or the rolling strides, or the Die polishing strides.

Sorry for this long explanation, but I has to take an extra high blood pressure pill of this cause post.
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 Posted 08/23/2022  11:57 pm  Show Profile   Bookmark this reply Add RW1010 to your friends list Get a Link to this Reply
You're right there is a scientific explanation. Now it just has to be 100% proven. I'm not sure if it has or not. I'm the small fry here so I don't have the answer. That theory led me to believe these were improperly annealed though which you agree they are. I just put one and one together and kept it simple. Thanks for the long explanation. I think it was very informative
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 Posted 08/24/2022  12:04 am  Show Profile   Bookmark this reply Add RW1010 to your friends list Get a Link to this Reply
Anyone else seeing that die clash? Looks like I've seen it before. Let me see if I can find it
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6244 Posts
 Posted 08/24/2022  12:13 am  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
For the Die Clash if it is not major sorry I can not help. Keep the best of the coins, or maybe all. You has the best bust for a collection of those annealing problem. Individually ? I do not know the value, but a hole series OH YES.
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