Altered surface. Done post mint Not a mint error of any kind. Take a metal pipe. Put it against the coin and strike it with a hammer very hard. That will give it the appearance your quarter shows. Why? Only the very angry person who did would know that.
Not sure the damage on the obverse, probably what Pickin and Grinin said that it is a vise job with the parallel lines of the vise. The damage on the reverse however shows that the quarter was mashed into another quarter. I reversed the image like looking at it in a mirror and I can make out "TER DOLL" as in "QUARTER DOLLAR" on the damaged area on the reverse of the quarter. To me, that's evidence that the damage was caused by a second quarter mashed into the quarter pictured in this thread. Here is a screenshot of the quarter that the OP posted: Next this is the same image that I reversed: