Thanks for those images. The upper one you can see a start running upward and s stoping point. The design we think were are seeing isn't really there. So it appears to be scuff/rub on the outer die between the columns. The bays are part of the fields which are the outer face of the die.

You can see the continued mark on the bay to the left of the bay in question. The last two images put this puzzle to an end for me.