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All Forums Category: World Coins and Currency Forums Forum: United Kingdom (Great Britain) Coins

Motley 1920 Pennies.

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Author Previous TopicReplies: 4 / Views: 578Next Topic  
MachinMachinMan
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 Posted 01/26/2025  11:01 pm Show Profile   Bookmark this topic Add MachinMachinMan to your friends list Get a Link to this Message Number of Subscribers
Maybe a metallurgist can explain what was wrong with some of the bronze planchets used in 1920.

Motley-1920-Pennies.

Motley-1920-Pennies.

That pale discolouration is in the metal of the coin. They are not stains.
Edited by MachinMachinMan
01/26/2025 11:04 pm
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Errers and Varietys
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 Posted 01/26/2025  11:17 pm  Show Profile   Bookmark this reply Add Errers and Varietys to your friends list Get a Link to this Reply
Probably from improper alloy mixing. https://www.error-ref.com/improper-alloy-mix/
Errers and Varietys.
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MachinMachinMan
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 Posted 01/26/2025  11:51 pm  Show Profile   Bookmark this reply Add MachinMachinMan to your friends list Get a Link to this Reply
Thanks Errors. Very poorly mixed indeed.
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HondoB
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 Posted 01/26/2025  11:55 pm  Show Profile   Bookmark this reply Add HondoB to your friends list Get a Link to this Reply
Yes, Errors is correct. The basic issue is improper alloy mixing - akin to "woodies". Environmental factors make it more apparent.
Check them closely for laminations.
UK 1 Penny 1921 "woody"
Motley-1920-Pennies.
Inordinately fascinated by bits of metal with strange markings and figures
Edited by HondoB
01/27/2025 12:48 am
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PaddyB
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 Posted 01/27/2025  03:57 am  Show Profile   Bookmark this reply Add PaddyB to your friends list Get a Link to this Reply
It has been suggested that the high numbers of these in the early 1920s was because the mint was using brass salvage shell cases left over from WW1 in the mix.
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All Forums Category: World Coins and Currency Forums Forum: United Kingdom (Great Britain) Coins



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