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All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins

1978 Quarter With Lump Of Metal

 
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Author Previous TopicReplies: 4 / Views: 282Next Topic  
Zelos
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United States
31 Posts
 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?
Adam_E
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United States
4378 Posts
 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.
merclover
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United States
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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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ça va bien aller
Coinfrog
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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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jbuck
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 Posted 11/24/2020  10:18 am  Show Profile   Bookmark this reply Add jbuck to your friends list Get a Link to this Reply
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All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins
 
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