Keep in mind that it isn't a small scratch/hit/contact mark that would keep it from being an MS coin...it would be a rub from wear. On a wheatie the most obvious place to look would be on his upper cheek and temple, and on the high points on the wheats. Not possible to determine that in your pictures.
In any case, as menioned it would not be worth submitting unless it is deserving of a very high grade.