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George III Halfpenny - PMD? Rusty Die?

 
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Author Previous TopicReplies: 6 / Views: 189Next Topic  
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785 Posts
 Posted 04/22/2021  6:14 pm Show Profile   Bookmark this topic Add molydeii to your friends list Get a Link to this Message
Details better at hand, the unusual marks seem very sharp and unlike ones affected by corrosion that I have seen before. Rusty dies? Most likely not, but want to hear your thoughts on this one

BTW, I used a flash with this picture. Coin isn't plated or such. Under natural light its chocolate brown.



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Edited by molydeii
04/22/2021 6:16 pm
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United States
4840 Posts
 Posted 04/22/2021  6:27 pm  Show Profile   Bookmark this reply Add Numisma to your friends list Get a Link to this Reply
PSD of some sort. Die rust couldn't produce deep pits like that, and I also see some displaced metal at the edge.
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 Posted 04/22/2021  6:33 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Agree, ED of some sort.
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 Posted 04/22/2021  7:09 pm  Show Profile   Bookmark this reply Add molydeii to your friends list Get a Link to this Reply
PSD is same as Post Mint Damage, PMD? Meaning it's just damage of some sort after coin was struck? Wondering what might have caused this deep pitting
My tradelist and some wanted items are here! : http://goccf.com/t/398127
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 Posted 04/22/2021  8:06 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
IMO, the pitting was caused by verdigris, seems to have been cleared out and passivated.
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 Posted 04/22/2021  8:48 pm  Show Profile   Bookmark this reply Add molydeii to your friends list Get a Link to this Reply
Sel_69l : yes! This sounds quite a reasonable explanation.
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Australia
13594 Posts
 Posted 04/22/2021  10:32 pm  Show Profile   Bookmark this reply Add Sap to your friends list Get a Link to this Reply
Rust on a die would create a hole or depression in the die, which would in turn create raised patches on the resultant coin.

What's happened here is "spot corrosion". The coin develops a mostly adequate oxide layer that prevents corrosion, but a couple of "holes" in the layer allowed damage to occur when the coin was subsequently placed in a corrosive environment (eg. buried in acidic soil).

The coin was then chemically cleaned, dissolving the corrosion but leaving "pits" where the corrosion used to be.

You can see some before-and-after pics of some very similar damage on a coin I cleaned in this old thread.
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