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Marks On Penny In 10 Piece Silver Proof Set

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United States
45 Posts
 Posted 09/18/2022  5:42 pm Show Profile   Bookmark this topic Add Goldeggsandham to your friends list Get a Link to this Message
I have long owned a 2001-S silver proof set and just now noticed marks on penny from either die chips or dirty die. I will have a Telmu microscope coming soon and I'll post photos.

Does anyone have such marks on coins in your proof sets or on proofs?
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United States
73646 Posts
 Posted 09/18/2022  6:36 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply




to the CCF!
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United States
47516 Posts
 Posted 09/18/2022  6:55 pm  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
Please use a memory card in your scope and do not take photos of the scopes screen and post them...thanks.
John1
( I'm no pro, it's just my humble opinion )
Searched 6.5 +/- Million Cents Since 1971
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United States
18 Posts
 Posted 09/19/2022  2:49 pm  Show Profile   Bookmark this reply Add cptbilly to your friends list Get a Link to this Reply
The cent in my 2021 Silver Proof Set has begun to tone (tarnish ?). All other coins in the capsule look fine.
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United States
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 Posted 09/24/2022  3:56 pm  Show Profile   Bookmark this reply Add Goldeggsandham to your friends list Get a Link to this Reply
Ok I got some pictures. I found out the marks are grain lines. The mirror polish makes the slightly wider grain lines more reflective. Original thread: http://goccf.com/t/431069





Coincidental that a visible grain line is behind Lincoln's head.
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17110 Posts
 Posted 09/24/2022  5:03 pm  Show Profile   Bookmark this reply Add JimmyD to your friends list Get a Link to this Reply
Who told you they were "grain lines"?
They look like linear plating bubbles.
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 Posted 09/24/2022  6:33 pm  Show Profile   Bookmark this reply Add Goldeggsandham to your friends list Get a Link to this Reply
Under a microscope, the marks are parallel with the grain.
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 Posted 09/24/2022  7:14 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Parallel with what grain? There is no grain on a cent.
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Canada
4612 Posts
 Posted 09/24/2022  8:08 pm  Show Profile   Bookmark this reply Add oriole to your friends list Get a Link to this Reply

Quote:
Parallel with what grain? There is no grain on a cent.


Yes, the last grain on a cent was in 1958!
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12365 Posts
 Posted 09/24/2022  9:24 pm  Show Profile   Check Dearborn's eBay Listings Bookmark this reply Add Dearborn to your friends list Get a Link to this Reply
linear plating bubbles, is what I think it is. above Liberty it looks like roller lines - which I think can trap zinc dust before the plating process. The zinc dust can expand and create the bubbles.
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 Posted 09/24/2022  11:57 pm  Show Profile   Bookmark this reply Add Goldeggsandham to your friends list Get a Link to this Reply
Not grain as in wheat, grain as in the crystalline structure of metal. I'm talking about grain like in this picture of a knife. Coins can have grain like that but not always visible to the naked eye



Dearborn, I've looked at photos of linear plating bubbles and saw some coins have a wood grain appearance at the naked eye. My penny doesn't have that unless under a microscope. The marks on the penny are concave and at first I thought they were convex.
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 Posted 09/25/2022  04:15 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
On the knife is 'grinding" lines,part of the sharping process. On your coin is a copper plating issue.
John1
( I'm no pro, it's just my humble opinion )
Searched 6.5 +/- Million Cents Since 1971
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 Posted 09/25/2022  10:36 am  Show Profile   Check Dearborn's eBay Listings Bookmark this reply Add Dearborn to your friends list Get a Link to this Reply

Quote:
The marks on the penny are concave and at first I thought they were convex.

so you are saying that the marks you circled are incuse and not raised?
Can you try to post up better pictures without the glare? Use only one light source from the side if possible.
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 Posted 09/25/2022  9:10 pm  Show Profile   Bookmark this reply Add Goldeggsandham to your friends list Get a Link to this Reply
Dearborn, here's some pictures of the penny under a microscope with front and back lighting. Top and bottom pictures are of the dimple by the date. The middle pictures are the line behind the head.





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12365 Posts
 Posted 09/25/2022  9:15 pm  Show Profile   Check Dearborn's eBay Listings Bookmark this reply Add Dearborn to your friends list Get a Link to this Reply
thanks for the new images, but you need to focus the scope on the field not the higher devices to see what is going on.
I'm also curious as to why your imaged are mirrored (backwards).
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 Posted 09/26/2022  12:49 am  Show Profile   Bookmark this reply Add datadragon to your friends list Get a Link to this Reply
The images do seem to most closely match linear plating blisters as suggested. https://www.error-ref.com/blisteredplating/ (rather than roller marks). Roller marks by comparison are lines caused when specks of dirt, grease, or other contaminants adhere to rollers which press planchet strips to a desired thickness. The debris is normally pressed into planchet metal forming incredibly straight, linear, fine parallel lines as the planchet strip is fed through the rollers. This effect is quite common in copper-alloy cents from the late 1970s and early 1980s. These coins do not show the cracking and peeling commonly seen in improper alloy mix errors. Roller marks are quite even while improper alloy mix streaks tend to vary in width. Roller marks are easily worn off while improper alloy mix streaks extend much deeper into the coin. Keep in mind that roller marks can appear on any coin - even improper mixtures or perhaps here as well.
Edited by datadragon
09/26/2022 12:55 am
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