This North-South opus reticulatum portion of the party wall to rooms H-10 and H-12 is associated with probable doorway between rooms H-10 and H-12 where the likely threshold tufo block 7358 is located. Being south of 7358 shows it was likely the southern limit of the original doorway, later plugged by 7359, being part of the original North-South running party wall along with 7357.