Can Anyone explain this Lincoln Roughy :)

I posted this a while back on a few other boards and had some interesting comments.
Your thoughts ?

 

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It could be a bad plating job. :goofer:

Whatever it is, it sure is kewl! :thumb:

Thanks for sharing!

Ribbit

 

This is what I call the Orange Peel look on some of the Lincoln Proof Cents! IMHO it is due to a light viscosity of grease or oil on the Dies creating pressure ridges on the surfaces when it was struck. I hope that Mike Diamond see this one as it the effect that I mentioned in a post way back last year or earlier!


Frank

 

I am with toad on this one. The die may be worn also, but the die would not cause all the lines to be parallel. That comes from the roller during the plating process.

 

This is what I thought at first but LOOK at the rest of the coin, there is no wear.
In Fact the Lincoln Statue on the Reverse and the Bow tie on the Obverse show EXTREME details, along with this being a PROOF coin, there does not seem to be that many strikes with this die.
The markings are also strange as the orange peel effect is definitely present over the Lincoln memorial but the rest does not seem to be the same thing ...
Just some of my thoughts

 

Maybe the Mint's cleaning lady used a brillo pad to clean the dies off. :goofer:

Ribbit

 

Very interesting. I was thinking the same thing as GD, but bobsmo makes a good point IMHO. Nice coin! :thumb:

Phoenix

 

Look at the obverse, Doug. Those lines go right through Abe and, less obviously, through the memorial. They are not raised as in the fields, but they are still there. And, how are you going to get die polishing lines that deep on a proof. That is clad separation.

 

Contamination on the zinc round. Could be some machine in the sheet formation prior to stamping them into rounds?

Ribbit

 

OK, the zinc is only rolled one direction. Can you assure me that the copper is rolled the same direction?

 

I am learning something here so, what if it were a contamination with a foreign object?

Again..I am just throwing this posibility out there! Cuz I do not know...


RickieB

 

I will concede that part of the problem may be an issue of a plating problem but I don't believe that it is the main culprit for the linear orange peel lines! I still think that the main culprit is an issue of pressure ridges that traveled outward as well as along (parallel) to the Die Polish lines. Note how squiggly the orange peel lines are on the coin. These sqiggly lines IMO can only be explained due to pressure ridges developing and traveling along the Die Polish lines and due to the extreme pressure at which the coins is struck, the grease or oil also exerted pressure outwards on those created pressure ridhge lines.

I edited and cropped the pictures of the coin and have attached them to this post. I hope that they better show all of the lines in the fields as well as through the devices!


Frank

 

The copper is not rolled? Just how does it get so thin if it is not rolled? I understand that there are 3 layers and they are sent through a roll to become one strip, but each of those 3 layers is rolled separately.