Lathe Rings?

[JonMN34]

Is this what I think it is? How does this happen?
I had recently found a 1996D with lathe rings and now this coin turns up with what appear to be lathe rings... on the edge... the marks continue all the way around the coin and are uniform. The coin is the correct diameter.
Any ideas?

[Browntown]

I have no idea how it happened...but it looks awesome. Maybe it has something to do with the machining of the collar...or the plating bunching up? I'm completely stumped.

[Shingpumps]

Is the coin thicker than usual?

[JonMN34]

No it is of normal thickness

[mustbebob]

There are no lathes used in the production of the coin blanks. They are punched out of sheets. The only thing I can think of is that the collar may have those marks, and it was transferred when struck.
Very interesting coin it's turning out to be.

[1sgret]

I agree with Bob that it most likely that the collar contains the lathe marks and it was transferred to the rim during stamping.

The only other scenario would be in the Upset Mill (applying the raised rims on the blanks) process and making them a Type II blank.

I have never seen one before like this.

[Browntown]

when the collar is made, is the hole punched out or drilled?

[trails]

One other consideration is the upset mill that forms the ridge on the blank turning it into a planchet. If a small metal burr was in that machine, where the coin edge came in contact with it, it would produce a small furrow on that edge, which would give it the appearance of lathe lines.

Speaking of which; here are some rather strong lathe marks on a 1960-D Lincoln cent.



BJ Neff