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

What Causes So Many Bumps On A 1989 Coin?

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bottimurillo90
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United States
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 Posted 06/06/2017  5:03 pm Show Profile   Bookmark this topic Add bottimurillo90 to your friends list Get a Link to this Message Number of Subscribers
Hello, would someone be able to explain why some coins have so many bumps on them? Found this coin in a penny roll and thought it was interesting.

Thank you.

What-Causes-So-Many-Bumps-On-A-1989-Coin?

What-Causes-So-Many-Bumps-On-A-1989-Coin?

What-Causes-So-Many-Bumps-On-A-1989-Coin?

What-Causes-So-Many-Bumps-On-A-1989-Coin?
John1
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 Posted 06/06/2017  5:22 pm  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
It is a plating issue. The planchet was not cleaned properly before copper plating. Very common in the 80's.
John1
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CoinMasters
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 Posted 06/06/2017  8:50 pm  Show Profile   Bookmark this reply Add CoinMasters to your friends list Get a Link to this Reply
it's a plating issue. They are called Plating Bubbles. They usually flatten when pushed.
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John1
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 Posted 06/07/2017  04:52 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
Only trapped gas bubbles will flatten when pressed down. This looks like trapped "hard" debris to me. Most likely zinc dust.
John1
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All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins



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