I found this Type 1 bicentennial Ike and on the reverse it has a very large check mark shaped strike through on it. Not the prettiest coin as I just freed it from its cellophane entrapment, but here's another one to add to the error collection.
It's an innie, not an outie. The matte like finish made it hard to get a good angle with the lighting.
Even with the decent pic, it's hard for me to say for certain. it looks like there is raised metal along the edges of the line.Displaced metal would indicate a scratch/gouge. Look at the coin objectively and see if you can determine if the edges are raised or absolutely flush with the field and devices. Don't "think" you see something. You should be able to determine this pretty quickly and have an answer.
No displacement, no raised areas, all edges are flush and I've looked this over from every angle, even down into the craters it passes through. It is just as smooth and flush as the crack in the Liberty Bell.
Something was going on at the Denver Mint that year. I have a 1976-D Ike also a T1 with a strikethrough on the obverse, right on the date.
Strikethroughs and PMD can be confusing. I found this 2017-P Lincoln recently, and I would say it has a strikethrough, or even two, but I am doubtful because I found it in "circulation," in the French sense of that word.
Looks like your typical bristle out of a wood handle wire brush. The squared shape at the bend is the giveaway. Cool find on an Ike. Still looking to come across one on any denomination myself. Congrats.