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All Forums Category: Australia, New Zealand, and South Pacific (Oceania) Coins and Currency Forums Forum: Variety & Error Coins, Bank Notes, Paper Money: Australia, New Zealand, & South Pacific (Oceania)

1 Of A Kind ? 2021 Aussie 5 Cent Coin.

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Author	Replies: 5 / Views: 588
crab eater Valued Member Australia 126 Posts	Posted 03/21/2022 04:23 am 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? Report this Post to the Staff

echidna Valued Member Australia 461 Posts	Posted 03/21/2022 05:42 am 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. Report this Post to the Staff
coaster Pillar of the Community Australia 1132 Posts	Posted 03/21/2022 05:54 am ... known as occluded gas bubbles. Report this Post to the Staff
crab eater Valued Member Australia 126 Posts	Posted 03/21/2022 06:45 am Gunna have to look that up ,thanks echidna and coaster Report this Post to the Staff
Sap Moderator Australia 14514 Posts	Posted 03/21/2022 8:13 pm 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 Report this Post to the Staff
jack108 New Member Australia 20 Posts	Posted 07/04/2022 10:28 pm I agree with the gas bubble theory, Certainly looks cool though. Report this Post to the Staff
	Replies: 5 / Views: 588

All Forums Category: Australia, New Zealand, and South Pacific (Oceania) Coins and Currency Forums Forum: Variety & Error Coins, Bank Notes, Paper Money: Australia, New Zealand, & South Pacific (Oceania)

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