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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	Replies: 4 / Views: 305
Zelos New Member United States 31 Posts	Posted 11/23/2020 11:29 pm 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? Report this Post to the Staff

Adam_E Pillar of the Community United States 4392 Posts	Posted 11/24/2020 12:19 am 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. Report this Post to the Staff
merclover Pillar of the Community United States 4658 Posts	Posted 11/24/2020 12:36 am Adam has it exactly. Probably found in/near a fire of some sort. PMD, no premium I'm afraid. to the CCF! ça va bien aller Report this Post to the Staff
Coinfrog Bedrock of the Community United States 53797 Posts	Posted 11/24/2020 08:53 am Ditto. to the CCF! Report this Post to the Staff
jbuck Moderator United States 94627 Posts	Posted 11/24/2020 10:18 am to the Community! Coin Collector Since 1978 My Avatar My Old Avatar My 7070 My Eisenhower Dollars CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
	Replies: 4 / Views: 305

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

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