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1929 P LWC Incused Date, Motto And Epu. Chemical? Environmental?

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stoneman227's Avatar
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 Posted 06/03/2019  4:04 pm  Show Profile   Bookmark this reply Add stoneman227 to your friends list Get a Link to this Reply
The areas you see the devices recessed are the ones that normally collect the most gunk from circulation .
A too aggressive cleaning of a gunked up coin with acetone can often leave iridescent fields in just the areas where you see recessed devices on your coin. This effect is the grease protecting and toning these spots.
It's the protected original field that is defining this anomaly
Edited by stoneman227
06/03/2019 4:07 pm
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Jim0815's Avatar
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5239 Posts
 Posted 06/03/2019  5:34 pm  Show Profile   Bookmark this reply Add Jim0815 to your friends list Get a Link to this Reply
stoneman, I just heard back from Mike and while he said he's never ran across this his answer was pretty much in line with your answer. Thanks for helping me figure this thing out!
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stoneman227's Avatar
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 Posted 06/03/2019  5:45 pm  Show Profile   Bookmark this reply Add stoneman227 to your friends list Get a Link to this Reply
Thanks for the update . It is damage , but rather cool damage!
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Jim0815's Avatar
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 Posted 06/03/2019  5:49 pm  Show Profile   Bookmark this reply Add Jim0815 to your friends list Get a Link to this Reply
Yes sir! I think I'll keep it for curiosities sake.
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coop's Avatar
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 Posted 06/03/2019  7:06 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
I suspect it was black in color. Then it was cleaned to lighten it up. Almost reminds me of the way the copper/nickel cent looked when I cleaned it . The surface metal falls off and leaves the lines. On mine, it was even worse. The surface was showing no lines, just looked like it was chizelled away. What was the weight of this one? If it was strongly cleaned, it should be under in weight. But years ago, the common thing to do to preserve coin was to put lacquer or varnish on coins to preserve them. On the devices, it looks like this may have happened as you see a haze on the devices. Just looks like a coin that may have been ruined years ago and they tried to fix it making it worse.
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Petespockets55's Avatar
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5780 Posts
 Posted 06/04/2019  9:17 pm  Show Profile   Bookmark this reply Add Petespockets55 to your friends list Get a Link to this Reply
John's thoughts seem spot on. One of those things that seems kind of obvious in hindsight.
Maybe they didn't know to use acetone to remove any grease that collected around the devices and used acid or vinegar instead. (Acid can be used to dissolve grease/oil spills). The gunk around the devices would have preserved those areas while working on the copper.
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