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1 Of A Kind ? 2021 Aussie 5 Cent Coin.

 
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Author Previous TopicReplies: 5 / Views: 588Next Topic  
Valued Member
Australia
126 Posts
 Posted 03/21/2022  04:23 am Show Profile   Bookmark this topic Add crab eater to your friends list Get a Link to this Message
G'Day again, Just noodled this coin and have not seen one like it before.
It has got raised 'bubble like' features which are in sort of a straight line.




Hard to photograph. The reverse is normal.
What do you think has caused this and have you seen one similar?
Valued Member
Australia
461 Posts
 Posted 03/21/2022  05:42 am  Show Profile   Bookmark this reply Add echidna to your friends list Get a Link to this Reply
Might be a bubble in the planchet.
When heated in the minting process it expands.
Advice is not a gift, but a debt that the old owe to the young.
Pillar of the Community
Australia
1132 Posts
 Posted 03/21/2022  05:54 am  Show Profile   Bookmark this reply Add coaster to your friends list Get a Link to this Reply
... known as occluded gas bubbles.
Valued Member
Australia
126 Posts
 Posted 03/21/2022  06:45 am  Show Profile   Bookmark this reply Add crab eater to your friends list Get a Link to this Reply
Gunna have to look that up ,thanks echidna and coaster
Moderator
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Australia
14514 Posts
 Posted 03/21/2022  8:13 pm  Show Profile   Bookmark this reply Add Sap to your friends list Get a Link to this Reply
On coins of pretty much any other country, it'd be dismissed as corrosion bubbles forming underneath the nickel plating. But Australian coins are still solid cupronickel, not plated.

The gas bubble theory is as good as any, though I'd expect to see some other evidence of extreme heating (discolouration, rippling, rim damage, etc).
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
New Member
Australia
20 Posts
 Posted 07/04/2022  10:28 pm  Show Profile   Bookmark this reply Add jack108 to your friends list Get a Link to this Reply
I agree with the gas bubble theory,
Certainly looks cool though.
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