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Posted 11/23/2008 09:33 am
There is one more lathe operation that is accomplished to the die before it is put into service and this maybe where the lines that are seen are coming from.
When the die is hubbed a ring is left (the part that was not compressed by the hub), six keys (they were originally used to re-align the hub to the die in multi hubbing processes) and a bulge around the neck of the die that was caused from the hubbing (compression). To remove these unwanted features, the die must be lathed and then polished to remove any marks left by the lathe. This is where the concentric circles may have possibly come from.
There are other examples where just one ring has been seen. John Wexler found a die (2004P Lincoln Cent) where there is a broken ring around the statue of Lincoln on the reverse. I have a complete small circle (raised line)on Lincoln's jaw line on a 1988 Lincoln Cent.
On the 1978 Ike dollar coin, after blowing the picture up, I do feel that this is a case of coin counter damage and not related to this thread.
BJ Neff
When the die is hubbed a ring is left (the part that was not compressed by the hub), six keys (they were originally used to re-align the hub to the die in multi hubbing processes) and a bulge around the neck of the die that was caused from the hubbing (compression). To remove these unwanted features, the die must be lathed and then polished to remove any marks left by the lathe. This is where the concentric circles may have possibly come from.
There are other examples where just one ring has been seen. John Wexler found a die (2004P Lincoln Cent) where there is a broken ring around the statue of Lincoln on the reverse. I have a complete small circle (raised line)on Lincoln's jaw line on a 1988 Lincoln Cent.
On the 1978 Ike dollar coin, after blowing the picture up, I do feel that this is a case of coin counter damage and not related to this thread.
BJ Neff
I looks to be an earlier state than the one I have.
