Ok yes now that to me looks like a struck through error. Its when something is between the die and the copper planchet when the die strikes the planchet. Something foreign like a staple. Thanks for posting another photo. It looks like the extra material was extruded below the 7, like if you push your finger down into wax an indention is make, but at the same time material is ejected from the coin where the indention is made. That also lines up with the mark on the 0. Here is a really good video on this error type. Watch it and tell me if thats what you also think it is? You will have to copy and paste the link im sorry.
https://www.youtube.com/watch?v=0PZ7-U5TG0o