Ring Marks On Jefferson Nickel

Hi Mike,

That's a great explanation! Thank you!

It also makes perfect sense!

So, Let me see if I have this straight:

A blank die is being machined to impart the conical shape to it prior to hubbing.

The concentric lines are a result of that process. Still, prior to hubbing the blank die, the steel would normally be polished, removing the concentric lines.

The blank die somehow misses that part of the process and goes on to be hubbed.

The hubbing process does not obliterate the concentric lines as the die is being hubbed resulting in a die with concentric lines and a coin struck, like the one above.

I know it may seem repetitive, I just want to get the picture straight in my head:-0

Thanks,
Bill

Hi Mike,

Thank You sir!

Bill

Yes, the generally accepted term is "concentric lathe marks".

Thanks amac44. I was thinking the same thing.

Mike

I've alway felt the lathe marks were deeper on the fields because the line are raised when the die material was made. With the marks that didn't get polished out being incuse on the die, the marks would appear raised on the coin. Kind of like why a doubled eyelid remains in the die. The device that formed that was set deeper into the die and the hubbing because of the pattern didn't remove that area. So a deeper hubbed impression would leave a raised area of the coins it creates. That is what I've figured what happened to create them.