Question for you Groovy radical dude? How does one know the difference from this and a "Strike Through". Is this in fact damage and a Stike through an error?
The term for the deeper, wider area is "Feeder-applied struck-through" The feeder scrapes on the die end up leaving piled up shaving on the die which is then struck-through. You are left with evidence of a die showing the result along with feeder mechanism die scrapes. This would have been done on a horizontal stroke Schuler Press with a Dial Feed mechanism see this photo
Not my first rodeo. This is my 3rd 2018. https://www.cointalk.com/threads/feeder-finger-die-damage.417407/
Thst looks really cool! It is debatable as a feeder finger error though, looks to me like a strike-through or lamination. Still worth a good premium.
Pete Apple described it in post #4 Feeder-applied struck-through debris. I have a couple other 2018 with feeder scrapes before the debris buildup so I was always looking for them.
I just looked at his post, and the info was pretty interesting. Do you know how long the Mint has used a Schuler press?
The first Schuler Presses arrived at the mint before October, 1987 and most likely operated with a Pusher Feeding Mechanism, since Schuler was not assigned a Dial Feeder Patent until 2018. The Patent for the Pusher Mechanism was granted June 10, 1969. Dial Feeders on Schuler Presses went into use around 2018. Use of press types other than Schuler were gradually phased out, and few (if any) in use after 2018.