| Author |
 Replies: 9 / Views: 1,282 |
|
|
Pillar of the Community
United States
936 Posts |
I found this roll searching and the obverse caught my eye, so I set it aside. I liked the way Lincoln looked "camouflaged" and would add it to my collection, anyways I noticed the reverse looked like it had some glue on it so I started tinkering with it. As I was tinkering with it I noticed it looked like it had been struck through something(and someone cleaned it, pity). The more I looked, the more I noticed what looked like part of it was raised, even though it is not. What I see is an outline of Lincoln on the reverse. Anyways, thought I would share-   Edited by chrsb
05/17/2008 11:40 pm
|
|
|
|
Pillar of the Community
United States
3507 Posts |
Hi,
I am not sure if the "stripes" are due to a bad alloy mix or something that happened to the coin after it left the mint. The ability to see a shadow of the obverse on the reverse of the coin is not due to a die clash.
This is difficult to describe if you've never seen the inside of a struck coin as you might in the case of a fully split planchet but you can see details in the metal even when the outer part of a planchet has broken away.
When a coin is struck, the pressure is such that the design is not just imparted to the surface of the coin. It is also transfered through the planchet as well. The design is , in a way struck through the planchet by virtue of the pressure of the strike.
There have even been other coins like this asked about in the past as this is seen more often on coins of the 1920s and 1930s. I can't tell you all the details that cause this to occur as I don't know them all.
That is what happens though. It is not a brockage or a clashed die. It is the motion of the metal through the planchet that is visible on your coin.
Thanks,
Bill
Edited by foundinrolls
05/17/2008 11:10 pm
|
|
Pillar of the Community
 United States
936 Posts |
Bill,
Thanks for the explanation, after I posted this, I was looking through a book of Lincoln cents and noticed a few pictures of cents in the 30's that had this on their reverse. I also started thinking that it could not be a clash as the profile would be recessed in the die and if they clashed the profile would not be transfered into the reverse die. My next thought was to much pressure or planchet flaw.
The strips on the front I think are from glue or some sort of clear film that is now gone, the reverse had it on it and came off with witch hazel.
I appreciate the response, thanks!
Edited by chrsb
05/17/2008 11:40 pm
|
|
Pillar of the Community
United States
2734 Posts |
I have to disagree with Bill. The reverse of your cent shows progressive, indirect design transfer -- a form of Die Deterioration. A vague outline of Lincoln's bust is tranferred to the reverse die through the medium of hundreds of thousands of planchets that are struck. It shows up on the coin as a vague incuse impression. This is especially common in S-mintmark cents from 1946 - 1948. Error coin writer and researcher.
Edited by mikediamond
05/18/2008 09:27 am
|
|
Pillar of the Community
United States
527 Posts |
If I understand Mike correctly, the pressure of the metal transfer eventually wears the opposite die. This results in something the looks like a blurred clash mark, it is blurred because of the indirect transfer through the planchet. I have often wondered why this doesn't happen more often. I think this has something to do with the dies being "softer" than normal. If the die materials are hardened properly they usually crack before this happens.
|
|
Pillar of the Community
United States
2734 Posts |
Actually, it's pretty common on wheaties. Probably has to do with the broad area of relatively low relief on the reverse that lies opposite the high-relief bust of Lincoln. Other issues where it's common is U.S. silver 3 cent pieces and older British pennies (pre-Elizabeth II). The key factor in both is a low thickness to area ratio in the planchet.
Error coin writer and researcher.
Edited by mikediamond
05/18/2008 6:04 pm
|
|
Bedrock of the Community
United States
62064 Posts |
I would have answered the multiple cleanings to remove clash marks remove that area of the die on the reverse. With the die reduced from cleanings in that area, the reverse would show that removal of metal as a raised area on the coins.
|
|
Pillar of the Community
United States
3507 Posts |
Hi Mike,
Help me with this one. I was trying to say that although I didn't get to the point where the die is effected.
Is the die effected by the coins themselves being struck or a transfer of details from one die to another.
Thanks,
Bill
|
|
Pillar of the Community
United States
2734 Posts |
It's a transfer of design outlines from the obverse die to the reverse die. Sometimes it's a reciprocal transfer in the case of silver 3c pieces. The planchet is the intermediary that allows the transfer to take place. It's not due to the obverse design bleeding through to the reverse face on any individual coin on any particular strike. It's a progressive distortion of the reverse die. It's best developed in late die states, which is what you'd expect.
Error coin writer and researcher.
|
|
Pillar of the Community
United States
3507 Posts |
Thanks Mike,
I got it...
Bill
|
| |
Replies: 9 / Views: 1,282 |
|
Posted 05/17/2008 11:38 pm
