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1978 Quarter With Lump Of Metal

 
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Author Previous TopicReplies: 4 / Views: 287Next Topic  
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United States
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 Posted 11/23/2020  11:29 pm Show Profile   Bookmark this topic Add Zelos to your friends list Get a Link to this Message
This 1978 quarter has 2 lumps in it. I'm curious if this is something that could have occurred from mint or if something happened to it afterwards. The obverse is perfectly fine with no recess or any kind of damage at all so it is either extra metal on coin or some kind of internal bubble?
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 Posted 11/24/2020  12:19 am  Show Profile   Bookmark this reply Add Adam_E to your friends list Get a Link to this Reply
Internal bubble is on the right track. This coin was heated by an extreme source of heat. The interior copper core melted, expanding and warping the exterior nickel cladding, which has a higher melting temperature than copper. But at that temperature the nickel is in a ductile transition state and can expand to the increased interior pressure from the copper.
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 Posted 11/24/2020  12:36 am  Show Profile   Bookmark this reply Add merclover to your friends list Get a Link to this Reply
Adam has it exactly. Probably found in/near a fire of some sort. PMD, no premium I'm afraid.

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 Posted 11/24/2020  08:53 am  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Ditto.



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