What is this ErrorsOnCoins struck-thru?

Looks like something thick, such as a piece of heavy card paper. Just a guess... Cheers, RickO

The edge of the strike thru is too sharp for grease.

The texture of the strike thru is too uniform for fabric.

The strike thru goes right up to the rim but not over it, so the material was malleable enough to expand under the force of the strike, but wasn't hard enough to deflect the collar.

My guess is that it was a piece of copper plating from another coin, or perhaps a piece of aluminum (are feeder fingers aluminum or steel?). It resembles coins I've seen that were struck through clad layers, though there's no reason for one of those to be near cent dies.

Sean Reynolds