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 Replies: 9 / Views: 1,503 |
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Valued Member
Canada
234 Posts |
I just found this "ugly coin" in a bulk lot of 5 cents. This is a 5 cents 1945 Victory. The remarkable aspect of this coin is its dimensions. Diameter 20.3 mm (20.9 nominal) Thickness 1.67 mm (1.84 nominal) Weight 3.64 g (4.54 nominal). The shape is a dodecagon as the normal coin. The edge is Nickle plated as the normal coin. So the coin is not grinded. It's magnetic as the regular coin. Is it a foreign planchet or a defective planchet or something else?   For comparison, this picture shows the thickness difference with a normal 1945 coin. The undersize coin is on the top. We see that the nickel plating looks similar on both coins.  |
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Pillar of the Community
Canada
2781 Posts |
severe environmental corrosion or acid bath
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Valued Member
 Canada
234 Posts |
I don't thinks so for now.
From Charlton Catalog, Nickel plating has a thickness of about 13 um.
The actual coin has a total thickness and diameter smaller than the nickel coating.
So an acid bath should have remove all nickel coating.
And the weight is about 20% lower.
Edited by SP67
12/10/2020 10:24 am
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Bedrock of the Community
United States
94367 Posts |
I lean toward acid bath as well. A number of partly-diluted acids could produce this effect, I'm guessing.
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Valued Member
Canada
234 Posts |
Thanks for your comments.
There's less than 0.1 g of nickle plating on normal coin.
The actual coin, weight about 0.67g lower than the normal coin and the Nickle is still there at most locations.
Maybe I'm wrong with my math, but this is why I'm excluding acid bath.
But maybe I'm missing something.
Edited by SP67
12/10/2020 11:10 am
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Pillar of the Community
Canada
870 Posts |
my thought is it could be a Dryer Coin. all the high points on the obverse have been worn down through the plating and rust has formed. |
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Pillar of the Community
 Canada
9862 Posts |
It's rusted.
All the weight loss and shrinkage is due to rust beneath the surface.
I have a truck bumper with the same affliction, there is slightly bubbly chrome surface but barely any steel behind the chrome.
"Dipping" is not considered cleaning...
-from PCGS website
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Valued Member
Canada
234 Posts |
Could Drier coin lost 20% of its mass by keeping good surface quality in many après?
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Moderator
 Canada
10456 Posts |
Quote:
So an acid bath should have remove all nickel coating True, but corrosion attacks the steel under the plating, just like the rear quarter panel of a 1965 Mustang... the painted (or in your case plated) surface is intact, but most of steel has oxidized. Secondly, I see a ton of altered coins from the 1940s whereby folks automatically assume a foreign planchet. Other than NFLD, the mint was not striking any foreign coins in the 1940s! "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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Valued Member
Canada
234 Posts |
Thanks to all of you. Closed file. This is a rusted coin, nothing more. For sure, I learned a lot with that exercice. This is the benefit of the Community  |
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Replies: 9 / Views: 1,503 |
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Posted 12/10/2020 09:59 am
