George III Halfpenny - PMD? Rusty Die?

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Author	Replies: 7 / Views: 1,652
molydeii Pillar of the Community Turkey 870 Posts	Posted 04/22/2021 6:14 pm 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. Edited by molydeii 04/22/2021 6:16 pm Report this Post to the Staff

Numisma Pillar of the Community United States 4963 Posts	Posted 04/22/2021 6:27 pm PSD of some sort. Die rust couldn't produce deep pits like that, and I also see some displaced metal at the edge. Report this Post to the Staff
Coinfrog Bedrock of the Community United States 94367 Posts	Posted 04/22/2021 6:33 pm Agree, ED of some sort. Report this Post to the Staff
molydeii Pillar of the Community Turkey 870 Posts	Posted 04/22/2021 7:09 pm 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 Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21788 Posts	Posted 04/22/2021 8:06 pm IMO, the pitting was caused by verdigris, seems to have been cleared out and passivated. Report this Post to the Staff
molydeii Pillar of the Community Turkey 870 Posts	Posted 04/22/2021 8:48 pm Sel_69l : yes! This sounds quite a reasonable explanation. Report this Post to the Staff
Sap Moderator Australia 16867 Posts	Posted 04/22/2021 10:32 pm 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. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis Report this Post to the Staff
molydeii Pillar of the Community Turkey 870 Posts	Posted 06/08/2021 6:16 pm Jumping back to an old thread, I have to say thanks to everyone, and specially to Sap for a very nice explanation of what might be wrong with my copper penny. Thanks everyone Report this Post to the Staff
	Replies: 7 / Views: 1,652

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