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Strange metal 1981 20 cent  
 

 
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Australia
2 Posts
 Posted 05/15/2018  9:39 pm Show Profile   Bookmark this topic Add Bobcat to your friends list Get a Link to this Message
I have an odd 1981 20 cent - shiny and only weighing in at 11g exactly. Photos show normal coin on left, strange one on right. It looks almost tinny and oily.

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Australia
2 Posts
 Posted 05/15/2018  9:42 pm  Show Profile   Bookmark this reply Add Bobcat to your friends list Get a Link to this Reply
Just realised I did the same picture twice here's the other side!
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United States
59010 Posts
Formerly nancyc
Australia
4829 Posts
 Posted 05/16/2018  6:32 pm  Show Profile   Bookmark this reply Add Nevol to your friends list Get a Link to this Reply
to CCF!

PMD, some sort of environmental damage.
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Nancy
Edited by Nevol
05/16/2018 6:36 pm
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Australia
1120 Posts
 Posted 05/19/2018  5:17 pm  Show Profile   Bookmark this reply Add Mr T to your friends list Get a Link to this Reply
Some 1981 20c pieces were produced in Canada and tend to have a brighter, more reflective surface for whatever reason too.
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Canada
4108 Posts
 Posted 05/22/2018  2:25 pm  Show Profile   Bookmark this reply Add Dorado to your friends list Get a Link to this Reply
To the Forum.
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United States
2308 Posts
 Posted 05/22/2018  2:41 pm  Show Profile   Check chafemasterj's eBay Listings Bookmark this reply Add chafemasterj to your friends list Get a Link to this Reply
Welcome to the Forum!
http://goccf.com/t/303774
Check out my counterstamped Lincoln Cent collection:
http://goccf.com/t/303507
Valued Member
Australia
179 Posts
 Posted 05/22/2018  8:24 pm  Show Profile   Bookmark this reply Add ryurazu to your friends list Get a Link to this Reply
Hmm I dont believe that is some error as all demcial coinage with new heads tend to have a high brilliance in unc condition, while the old head demicals have a more tone down luster similar to predemcial unc coins, a orangey grey colour luster.
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Australia
3069 Posts
 Posted 05/30/2018  08:14 am  Show Profile   Bookmark this reply Add gxseries to your friends list Get a Link to this Reply
I swear there must have been some changes to the alloy or the planchets have gone through different chemical bath treatment.

Early nickel copper coins struck before 1980s have a duller grey look whereas post 1990s have a much brighter polish look. I've seen some worn out post 2000s coins but they still have a different overall look compared to some XF+ coins that I find in circulation.
My partial coin collection http://www.omnicoin.com/collection/gxseries

My numismatics articles and collection: http://www.gxseries.com/numis/numis_index.htm Regularly updated at least once a month.
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Australia
1120 Posts
 Posted 06/01/2018  9:36 pm  Show Profile   Bookmark this reply Add Mr T to your friends list Get a Link to this Reply
Possibly - I think Australia stopped making planchets and started importing them in the 1980s at some point.
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