I found this quarter while metal detecting, thus the coloring. However there are a number of raised “bumps” on the obverse (there are a few minor ones on the reverse) and I’m curious what may have caused them.
First years of the Clad over Copper core..(started 1965). Many years of it buried would affect the clad layer. Even cause weird bubbles. Depends on the environment.
It's environmental damage. Heat (my choice)? Buried? Chemicals? Some combination? It's almost impossible to say for certain. My recommendation is to concentrate on what causes mint errors and not what causes damage. You'll go nuts trying to figure it out
This coin has been in a fire to cause it to get bubbled up. The heat caused the clad layers to start separating
Perhaps but I’m trying to learn as much as possible and this falls in that realm. I was certain it was damage but wasn’t sure what would cause it. Now I’m a bit closer to understanding.
Ever have a camp fire? next time ... throw some coins in it and check them from time to time. Have a few in lighter heat, heavier heat, the red coals, etc. it will vary and you can document and learn from it.
