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 Replies: 22 / Views: 3,147 |
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Pillar of the Community
Canada
1159 Posts |
Need help on this 1980 penny struck on what planchet. 2.88 grams and non magnetic   |
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Pillar of the Community
Canada
1984 Posts |
I have a 1980 2.87g which I think is struck on cupro nickel NZ 5 cents
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Pillar of the Community
Canada
3328 Posts |
If it was cupro nickel it should be magnetic. Weight does seem a fair bit under and I don't see a ton of wear. The holder stats non magnetic (which is normal for this year) also says rare, did you lable it? And if not did they explain why it is rare? The non magnetic lable is fairly pointless for this one either way.
Edit: not sure the composition of NZ 5¢ but most if not all cupro nickel Canadian coins are magnetic. So not a definitive way to tell.
Edited by Wrekkdd
12/19/2021 4:44 pm
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Pillar of the Community
 Canada
5585 Posts |
My understanding is that most, if not all, cupro-nickel material is NOT magnetic. It depends on the actual alloy, for sure, but it would have to be highly nickel and, then, with a fairly strong magnet.
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Valued Member
Canada
342 Posts |
Cupro coins are 75% copper and 25% nickel. Maybe not that magnetic?
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Pillar of the Community
Canada
3328 Posts |
Okiecoiner is correct sorry. Most cupro nickel coins are non magnetic so it wouldn't be a viable way to know for sure.
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Pillar of the Community
Canada
891 Posts |
Normal weight is 2.80 and it is 98 % copper so not magnetic , maybe plated
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Pillar of the Community
Canada
3328 Posts |
I was off on weight to, forgot the 80-81 were much lighter compared to 79 and earlier.
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Pillar of the Community
Canada
1984 Posts |
Old Mike....the stats on a normal cent are not relevant. This is struck on a different planchet.
Cupro nickel is generally not magnetic. I will pull out my NZ coin and test it later. But check any silver coloured cupro nickel UK coin from 1947 to 1967....all non mag.
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Moderator
 Canada
10456 Posts |
In can be tougher to tell. I usually XRF these coins. If there are traces of tin (Sn) and zinc (Zn), then it is likely a plated coin. Just copper (Cu) and nickel (Ni) and you have a good coin! Here is my 1979 1c struck on a New Zealand Cu-Ni 5-cent, the thinner planchet made it a weak strike - anything 1980 and newer should be almost fully struck:  "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Pillar of the Community
 Canada
1159 Posts |
SPP maybe one day I will have to send it your way just to make sure.
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Pillar of the Community
Canada
1618 Posts |
Quote:
anything 1980 and newer should be almost fully struck Interesting, what makes you say that SPP? Did the planchet thickness change between 1979 and 1980? |
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Pillar of the Community
Canada
1984 Posts |
The RCM made Australia 5 cents for 1981 (2.8g, CuNi) and NZ 5 cents for 1978 and 1981 (2.83g CuNi). These are candidates for 1979 and 1980 Canadian cents. Here are three coins: 1979 non mag 2.84g cent, 1980 non mag cent 2.9g, and Australia 1980 5 Cents non mag 2.89g. In hand the planchets all looks identical. None are plated. As you say SPP, looks like the 1979 is NZ and the 1980 is Australia.   Edited by Smallcentguy
12/20/2021 09:49 am
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Pillar of the Community
Canada
668 Posts |
I'd be interested to see what this xrf's like.
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Pillar of the Community
Canada
1159 Posts |
When I look at that coin at the highest magnification with the microscope, coins have that pitty graininess. This coin has that and the proper look with no sign at all of copper. It might be the real thing with the proper weight. Smallcentguy you sure got me thinking now.
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Pillar of the Community
Canada
1618 Posts |
Quote:The RCM made Australia 5 cents for 1981 (2.8g, CuNi) and NZ 5 cents for 1978 and 1981 (2.83g CuNi). The RCM also struck NZ 5c coins in 1980. Quote:
These are candidates for 1979 and 1980 Canadian cents. If the RCM struck coins in 1981 for Australia and NZ, the OPs coin cant be on those planchets, as his was struck on a 1980 1c die, which wouldnt have been around in 1981. |
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Replies: 22 / Views: 3,147 |
Posted 12/19/2021 4:36 pm
